File related functions/file IO

File information correlation

`filetype()`

filetype($filepath); Get the type of the file; Returns the type of the file

Returns the type of the file
Parameters:filepathFile path
The possible values arefifo.char.dir.block.link.file 和 unknown
Returns if there is an errorFALSE


      

$file_path = 'sort.php';
$dir_path = '.. / 0809 ';

var_dump(filetype($file_path)); // file
var_dump(filetype($dir_path)); // dir
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D:\php20190701\php_code\0810\filetype.php:6:string 'file' (length=4)
D:\php20190701\php_code\0810\filetype.php:7:string 'dir' (length=3)
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`filesize()`

filesize($filename); Get the size of the file; Returns the number of bytes;

Returns the number of bytes of file size, or if there is an errorFALSEAn E_WARNING error is generated
Note: Because PHP’s integer type is a signed integer and many platforms use 32-bit integers, some file system functions may return unexpected results for files larger than 2GB
Parameter :filename Specifies the path to the file



      

$file_path = 'sort.php';

var_dump(filesize($file_path)); / / 101 bytes
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`filectime()`

filectime($filename); Get the creation time of the file; It returns a timestamp;

Returns the time when the file was created, or on failureFALSE
The time is returned as a Unix timestamp
Because it returns a timestamp, you can use the date() function to change the date and time zone;
- Change timezone: date_default_timezone_set(‘PRC’);
- Date (‘ y-m-d H: I :s’,filectime($filename));
Parameter :filename Specifies the path to the file

`filemtime()`

filemtime($filename); Get the modification time of the file; It returns a timestamp;

Returns the last time the file was modified, or on failureFALSE
The time is returned as a Unix timestamp and can be used for date()
(The date() function above)
Parameter :filename Specifies the path to the file

`fileatime()`

fileatime($filename); Get the last access time of the file; It returns a timestamp;

Returns the last time the file was accessed, or on failureFALSE
The time is returned as a Unix timestamp
Because it returns a timestamp, you can use the date() function to change the date and time zone;
- The date() function looks like this; Change time zone and change to visible date;
Parameter :filename Specifies the path to the file


      

$file_path = 'sort.php';

var_dump(date('Y-m-d H:i:s',filectime($file_path))); 
var_dump(date('Y-m-d H:i:s',filemtime($file_path))); 
var_dump(date('Y-m-d H:i:s',fileatime($file_path))); 
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D:\php20190701\php_code\0810\filetype.php:5:string 'the 2019-08-10 10:52:53' (length=19)
D:\php20190701\php_code\0810\filetype.php:6:string 'the 2019-08-10 11:15:33' (length=19)
D:\php20190701\php_code\0810\filetype.php:7:string 'the 2019-08-10 10:52:53' (length=19)
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`is_readable()`

is_readable($filename); Check whether the file is readable; Returns a Boolean value;

Returns if the file or directory specified by filename exists and is readableTRUEOtherwise returnFALSE
Parameter :filename Specifies the path to the file

`is_writable()/is_writeable()`

is_writable($filename)/is_writeable($filename); Check whether the file is writable; Returns a Boolean value;

Returns if the file filename exists and is writableTRUE
The filename argument can be a directory name that allows writability checks
Is_writeable () is an alias of is_writable()
Parameters:filenameThe name of the file to check


      

$file_path = 'sort.php';

var_dump(is_readable($file_path));
var_dump(is_writable($file_path));
var_dump(is_writeable($file_path));
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D:\php20190701\php_code\0810\filetype.php:5:boolean true
D:\php20190701\php_code\0810\filetype.php:6:boolean true
D:\php20190701\php_code\0810\filetype.php:7:boolean true
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`is_executable()`

is_executable($filename); Check whether the file is executable; Returns a Boolean value;

Determines whether the given filename is executable
Returns if the file exists and is executableTRUE, returns if there is an errorFALSE
FALSEIndicates that the file is not executable.
Parameters:filenameFile path


      

$file_path = "C:\Users\Administrator\AppData\Local\Programs\Microsoft VS Code\Code.exe";

var_dump(is_executable($file_path)); // true
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`is_file()`

is_file($filename); Check whether it is a file; Returns a Boolean value;

Determines whether the given filename is a normal file
Returns if the file exists and is a normal fileTRUEOtherwise returnFALSE
Note: Because PHP’s integer type is a signed integer and many platforms use 32-bit integers, some file system functions may return unexpected results for files larger than 2GB
Parameter :filename Specifies the path to the file


      

$file_path = 'sort.php';
$dir_path = '.. / 0809 ';

var_dump(is_file($file_path)); // true
var_dump(is_file($dir_path)); // false
var_dump(is_dir($dir_path)); // true
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`pathinfo()`

pathinfo($filename); Obtain file path information. Returns an associative array;

The parameter is the file path
Returns information about an associative array that contains path
Returns an associative array or a string depending on options
If no options are passed, an array containing the following elements is returned: dirName, basename, and extension (if any), and filename
The options examples:
- echo pathinfo($filename,PATHINFO_EXTENSION);——- Obtain the file name extension
Options If specified, returns the specified element; They include:
- PATHINFO_DIRNAME
- PATHINFO_BASENAME
- PATHINFO_EXTENSION
- PATHINFO_FILENAME
If no options are specified, all units are returned by default
__FILE__saidThe full path and filename of the file


      

$file_path = 'sort.php';

var_dump(pathinfo($file_path)); // true
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D:\php20190701\php_code\0810\filetype.php:5:
array (size=4)
  'dirname' => string '. ' (length=1)
  'basename' => string 'sort.php' (length=8)
  'extension' => string 'php' (length=3)
  'filename' => string 'sort' (length=4)
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`dirname()`

dirname($path); Returns the path portion of the file;

Given a string containing the full path to a file, this function returns the directory name with the filename removed
Return value: Returns the parent directory of path
Parameter: path A path
In Windows, both slashes (/) and backslashes (\) can be used as directory separators
Slash (/) in other contexts


      

$file_path = 'C: \ Users \ \ Administrator \ Downloads \ Firefox Setup 69.0 b11 exe';
$file_path2 = 'C: / Users/Administrator/Downloads/Firefox Setup 69.0 b11. Exe';

var_dump(dirname($file_path)); 
var_dump(dirname($file_path2));
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D:\php20190701\php_code\0810\filetype.php:6:string 'C:\Users\Administrator\Downloads' (length=32)
D:\php20190701\php_code\0810\filetype.php:7:string 'C:/Users/Administrator/Downloads' (length=32)
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`basename()`

basename($filename,$suffix); Returns the file name part of the path;

Given a string containing the full path to a file, this function returns the base filename
Parameter: path A path
In Windows, both slashes (/) and backslashes (\) can be used as directory separators
Slash (/) in other contexts
The second parameter is optional. Specifies the file extension. If the file has suffix, this extension is not printed.


      

$file_path = 'C: \ Users \ \ Administrator \ Downloads \ Firefox Setup 69.0 b11 exe';

var_dump(basename($file_path));
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D:\php20190701\php_code\0810\filetype.php:6:string 'Firefox Setup 69.0 b11. Exe' (length=25)
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$file_path = 'C: \ Users \ \ Administrator \ Downloads \ Firefox Setup 69.0 b11 exe';

var_dump(basename($file_path,".exe")); / / 'Firefox Setup 69.0 b11'

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`file_exists()`

file_exists($filename); Check whether files or directories exist; Returns a Boolean value;

Return value: Returns if the file or directory specified by filename existsTRUEOtherwise returnFALSE
Parameter: filename Specifies the path to a file or directory


      

$file_path = "sort.php";
$dir_path = ".. / 0809";
$dir_path2 = ".. / 080911";

var_dump(file_exists($file_path)); // true
var_dump(file_exists($dir_path)); // true
var_dump(file_exists($dir_path2)); // false
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File operation correlation

`touch()`

The touch ($filename, $time, $atime); Set the access and modification time of the file. If the file does not exist, the file will be created. Returns a Boolean value

Parameter: filename Specifies the name of the file to be set
If the file does not exist, it will be created
Return value: Returned on successTRUEOr return on failureFALSE
Time Time to be set. If no time parameter is provided, the current system time is used
Atime If given, the access time of the given file is set to atime, otherwise it is set to time
If these two parameters are not given, the current system time is used
The second parameter: sets the modification time
Third parameter: Sets the access time

`unlink()`

unlink($filename,$context); Delete files; Returns a Boolean value;

Delete the filename
Parameter: filename Specifies the path to the file
An E_WARNING level error is generated when an error occurs
Return value: Returned on successTRUEOr return on failureFALSE


      

$file_path = "sort.php";


var_dump(unlink($file_path)); // true
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`rename()`

Rename ($oldname, $newname, $path); Rename or cut a file or directory; Returns a Boolean value;

Try to put theoldnamerenamenewname
Return value: Returned on successTRUEOr return on failureFALSE
Path Path to cut a file or directory
Same path, usually rename


      

$old_name = "sort.php";
$new_name = "sort2.php";

var_dump(rename($old_name,$new_name)); Sort2.php will be added to sort2.php
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If the path is different, you can achieve the effect of shearing


      

$old_name = "sort2.php";
$new_name = ".. /sort2.php";

var_dump(rename($old_name,$new_name)); // true to achieve the clipping effect
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`copy()`

copy($filename,$path); Copy a file; Returns a Boolean value;

$filename, the file name
$path: indicates the path to be copied
Return value: Returned on successTRUEOr return on failureFALSE
Pay attention toTo copy remote files, enable the PHP configuration optionsallow_url_fopen=On
Remote copy, equivalent to download


      

$old_name = "sort.php";
$new_name = "sort2.php";

var_dump(copy($old_name,$new_name)); // true
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$old_name = "http://pic68.nipic.com/file/20150601/2692994_151045402000_2.jpg";
$new_name = "1.jpg";

var_dump(copy($old_name,$new_name)); / / download
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The file content is related to the operation

`fopen()`

fopen(filename,mode)

The fopen() function opens a file or URL.
If fopen() fails, it returns FALSE with an error message.
Error output can be hidden by prefixing the function name with an ‘@’.
Returns a file handle, which is a resource type that needs to be used with other functions
Second parameter: how to open, how to open
- “R” (open read-only, pointer to file header)
- “R +” (open read/write mode, pointer to file header)
- “W” (open write mode, clear file contents, try to create file if it doesn’t exist)
- “W +” (read/write open, clear file contents, try to create file if it doesn’t exist)
- “A” (write mode on, write file pointer to end of file, try to create file if it doesn’t exist)
- “A +” (open in read/write mode, save the contents of the file by writing the file pointer to the end)
- If the file is not found, r will report an error, but A and W will create a new file


      

$file_path = "test.txt";


var_dump(fopen($file_path, 'r')); // resource
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`fread()`

string fread ( resource length )

The fread() function reads the open file.
The function stops running when the specified length is reached or the end of the file (EOF) is read, whichever comes first.
This function returns the string read, or FALSE on failure.


      

$file_path = "test.txt";


$file = fopen($file_path, 'r');

var_dump(fread($file,99)); // hello world !
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$file_path = "test.txt";


$file = fopen($file_path, 'r');

var_dump(filesize($file_path));

var_dump(fread($file,filesize($file_path))); // hello world !
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`fwrite()|fput()`

fwrite(file,string[,length])

The fwrite() function writes to an open file.
The function stops running when the specified length is reached or the end of the file (EOF) is read, whichever comes first.
The second argument, optional, is the maximum number of characters that can be written
If the function executes successfully, the number of bytes written is returned. On failure, return FALSE.


      
$file = fopen("test.txt"."w");
echo fwrite($file,"Hello World. Testing!");
fclose($file);
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`fclose()`

fclose($file)

The fclose() function closes the open file.
This function returns TRUE on success and FALSE on failure.


      
$file = fopen("test.txt"."r");
//some code to be executed
fclose($file);
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`fgetc()`

fgetc(file)

Read one character at a time


      


$file = fopen("test.txt"."r");

for ($i=0; $i < filesize('test.txt'); $i++) { 
	echo fgetc($file);
}


while(! feof($file)) {echo fgetc($file);
}
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`fgets()`

fgets(file[,length])
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Reads one line of characters at a time, including the trailing newline character


      

$file = fopen("test.txt"."r");

while(! feof($file)) {echo fgets($file);
}
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`fgetss()`

fgetss(file[,length[,tags]])
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Read one line at a time, filtering HTML tags

`fgetcsv()`

fgetcsv(file[,length[,separator[,enclosure]]])
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Get one line of the CSV file at a time and convert the line into an indexed array


      


$file = fopen("index.csv"."r");

while ($arr = fgetcsv($file)) {
	var_dump($arr);
}

fclose($file);

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`fputcsv()`

fputcsv(file,fields[,seperator[,enclosure]])
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Turn the CSV array


      


$file = fopen("index.csv"."r+");

$arr = [
	'hello'.'world'.'!!!!!!! '
];


var_dump(fputcsv($file, $arr));
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`file_get_contents()`

Saves the contents of the file in a string, based on the path
This parameter is mandatory. The opening mode is not specified. If the parameter is a web address, the HTML source code corresponding to the web address is returned
To enable openSSL in php.ini,extension=php_openssl.dll


      


$str = file_get_contents("index.csv");

var_dump($str);
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`file_put_contents()`

Save the string to a file
Save the baidu source code to the local


      

file_put_contents('baidu.html', file_get_contents('https://www.baidu.com'));
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`file()`

The file () function reads the entire file into an array.
According to line breaks, a line is an element that preserves the following line breaks

`readfile()`

Read the contents of the file and save them to a variable
The first parameter: the file path


      

$str = readfile('test.txt');
var_dump($str);
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`parse_ini_file()`

The number parses a configuration file and returns its Settings as an array with a path


      

var_dump(parse_ini_file("C: \ phpStudy \ PHPTutorial \ PHP \ PHP - 7.2.1 - NTS \ PHP ini"));
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`parse_ini_string()`

Convert the configuration file string to an associative array


      

$ini_string = ' xdebug.profiler_output_dir="C:\phpStudy\PHPTutorial\tmp\xdebug" xdebug.trace_output_dir="C:\phpStudy\PHPTutorial\tmp\xdebug" Zend_extension = "C: \ phpStudy - 7.2.1 - NTS \ PHPTutorial \ PHP \ PHP \ ext \ php_xdebug - 2.8.0 beta1-7.2 - vc15 - NTS. DLL." " xdebug.remote_enable = 1 xdebug.remote_autostart = 1 ';


var_dump(parse_ini_string($ini_string));
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`highlight_string()`

Highlight the PHP code in the string. The argument is a string

`highlight_file()`

Highlight the PHP code in the file with the file path


      

var_dump(highlight_file('test.php'));
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[PHP from small white to big bull]-019 PHP file IO

File related functions/file IO

File information correlation

filetype()

filetype($filepath); Get the type of the file; Returns the type of the file

filesize()

filesize($filename); Get the size of the file; Returns the number of bytes;

filectime()

filectime($filename); Get the creation time of the file; It returns a timestamp;

filemtime()

filemtime($filename); Get the modification time of the file; It returns a timestamp;

fileatime()

fileatime($filename); Get the last access time of the file; It returns a timestamp;

is_readable()

is_readable($filename); Check whether the file is readable; Returns a Boolean value;

is_writable()/is_writeable()

is_writable($filename)/is_writeable($filename); Check whether the file is writable; Returns a Boolean value;

is_executable()

is_executable($filename); Check whether the file is executable; Returns a Boolean value;

is_file()

is_file($filename); Check whether it is a file; Returns a Boolean value;

pathinfo()

pathinfo($filename); Obtain file path information. Returns an associative array;

dirname()

dirname($path); Returns the path portion of the file;

basename()

basename($filename,$suffix); Returns the file name part of the path;

file_exists()

file_exists($filename); Check whether files or directories exist; Returns a Boolean value;

File operation correlation

touch()

The touch ($filename, $time, $atime); Set the access and modification time of the file. If the file does not exist, the file will be created. Returns a Boolean value

unlink()

unlink($filename,$context); Delete files; Returns a Boolean value;

rename()

Rename ($oldname, $newname, $path); Rename or cut a file or directory; Returns a Boolean value;

copy()

copy($filename,$path); Copy a file; Returns a Boolean value;

The file content is related to the operation

fopen()

fread()

fwrite()|fput()

fclose()

fgetc()

fgets()

fgetss()

fgetcsv()

fputcsv()

file_get_contents()

file_put_contents()

file()

readfile()

parse_ini_file()

parse_ini_string()

highlight_string()

highlight_file()

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`filetype()`

`filetype($filepath); Get the type of the file; Returns the type of the file`

`filesize()`

`filesize($filename); Get the size of the file; Returns the number of bytes;`

`filectime()`

`filectime($filename); Get the creation time of the file; It returns a timestamp;`

`filemtime()`

`filemtime($filename); Get the modification time of the file; It returns a timestamp;`

`fileatime()`

`fileatime($filename); Get the last access time of the file; It returns a timestamp;`

`is_readable()`

`is_readable($filename); Check whether the file is readable; Returns a Boolean value;`

`is_writable()/is_writeable()`

`is_writable($filename)/is_writeable($filename); Check whether the file is writable; Returns a Boolean value;`

`is_executable()`

`is_executable($filename); Check whether the file is executable; Returns a Boolean value;`

`is_file()`

`is_file($filename); Check whether it is a file; Returns a Boolean value;`

`pathinfo()`

`pathinfo($filename); Obtain file path information. Returns an associative array;`

`dirname()`

`dirname($path); Returns the path portion of the file;`

`basename()`

`basename($filename,$suffix); Returns the file name part of the path;`

`file_exists()`

`file_exists($filename); Check whether files or directories exist; Returns a Boolean value;`

`touch()`

`The touch ($filename, $time, $atime); Set the access and modification time of the file. If the file does not exist, the file will be created. Returns a Boolean value`

`unlink()`

`unlink($filename,$context); Delete files; Returns a Boolean value;`

`rename()`

`Rename ($oldname, $newname, $path); Rename or cut a file or directory; Returns a Boolean value;`

`copy()`

`copy($filename,$path); Copy a file; Returns a Boolean value;`

`fopen()`

`fread()`

`fwrite()|fput()`

`fclose()`

`fgetc()`

`fgets()`

`fgetss()`

`fgetcsv()`

`fputcsv()`

`file_get_contents()`

`file_put_contents()`

`file()`

`readfile()`

`parse_ini_file()`

`parse_ini_string()`

`highlight_string()`

`highlight_file()`