1. Solve cross-domain problems

public function __construct()
{
    parent::__construct();
    header('Access-Control-Allow-Origin:*');    / / across domains
}
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2, jSON_encode Chinese do not transcode

die( json_encode( $result,JSON_UNESCAPED_UNICODE ) );
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3, two-dimensional array sort

$users = array(
    array('name'= >'xiao1'.'age'= >20),
    array('name'= >'xiao2'.'age'= >18),
    array('name'= >'xiao3'.'age'= >22));/* In ascending order by age */
// The age is extracted and stored in a one-dimensional array, then sorted in ascending order by age
$ages= array_column($users.'age');
array_multisort($ages, SORT_ASC, $users);
 
/* First by age, then by name */
$ages= array_column($users.'age');
$names = array_column($users.'name');
array_multisort($ages, SORT_ASC, $names, SORT_DESC, $users);
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If PHP. Ini is closed on Linux server, result 406,500. Error information is printed.

ini_set("display_errors"."On");
error_reporting(E_ALL | E_STRICT);
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5. Use of list

/ / the list to use
public function test(){
    list($name.$sex) = $this->getInfo();
    echo "Name:{$name}Gender:{$sex}";
}
 
public function getInfo(){
    return ['Joe'.'male'];
}
 
// Output: name: Zhang SAN, gender: male
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6. Use of array_column()

$array= [['id'= >'99'.'name'= >'Ninety-nine'],
    ['id'= >'88'.'name'= >'Eighty-eight'],
    ['id'= >'77'.'name'= >'Seventy-seven']];$arr1 = array_column($array.'name');   
// array (0 => '99 ',1 =>' 88 ',2 => '77 ',)
$arr2 = array_column($array.'name'.'id'); 
/ / output: array (99 = > 'ninety-nine', 88 = > 'eighty-eight', 77 = > 'seventy-seven',)
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Array_column () is used with array_combine()

$ids = array_column($array.'id');
$arrayCombine = array_combine($ids.$array);
/ * $arrayCombine output: Array (99 = > array (' id '= >' 99 ', 'name' = > 'ninety-nine', a), 88 = > array (' id '= >' 88 ', 'name' = > 'eighty-eight',), 77 = > array (' id '= >' 77 ', 'name' = > 'seventy-seven',),) * /
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Delete 0,null, index reset

$array = array(0.1.0.2.null.1.3.4.null.0);
$array = array_values(array_unique(array_diff($array[0.null)));/ / remove 0, null; duplicate removal
var_export($array);
 
/ * output: array (0 = > 1, 1 = > 2, 2 = > 3, 3 = > 4,) * /
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Convert seconds to minutes

Convert seconds to seconds, gmstrftime function, but this function is limited to the conversion of seconds within 24 hours.

$r = gmstrftime('%H:%M:%S', (3600*23) +123);
var_export($r);
// Output: '23:02:03'
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9. Interface return

The interface returns 1 in normal state and -1 in abnormal state. If the data is empty, it is 1; -1 indicates a parameter exception or logical error.

10, round to keep 2 decimal places.

round($x.2);
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11. Hide the middle four digits of your phone number.

$num = "13711111111";
$str = substr_replace($num.'* * * *'.3.4);
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12. Newline variable PHP_EOL

Usage scenario: a small line feed, in fact, different platforms have different implementations. The Unix world uses /n instead of newline, but Windows uses /r/n to differentiate itself, and more interestingly, /r on the MAC. PHP_EOL is a variable defined in PHP that represents a line break in PHP. This variable will vary depending on the platform, and will be /r/n on Windows, /n on Linux, and /r on MAC.Copy the code

Isset (), array_key_exists(), empty()

$array = ['a'= >'I was the first.'.'b'= >'I'm the second one'.'c'= >'I'm the third.'.'f'= >null];
if(isset($array['a']) {echo There 'a';
} else {
    echo 'A does not exist';
}

if(array_key_exists('d'.$array)) {
    echo 'd there';
} else {
    echo 'd does not exist ';
}

if (empty($array['f']) {echo 'F does not exist';
} else {
    echo 'f exists and is not null,0,"0",false';
}
 
// A exists d does not exist F does not exist
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14, introduce js file, with parameters? _ = 1553829159194

Sometimes the address has an argument like this, right? _ = 1553829159194

http://***/index/index?_=1553829159194
Add a timestamp after the URL to ensure that the URL changes each time, so that the browser cache is not read.

15. Interface testing tools

The interface test tool postman is recommended

16. If the last word is “area”, delete it.

$distName = 'Nanshan';
$lastChar = mb_substr($distName, -1);
if($lastChar= ='area') {$lastChar = mb_substr($distName.0, -1);
}
echo $lastChar;
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17. Assume the page content is as follows:

The data structure returned from the background:

{"eat": ["Rice"."Wheat"]."drink": ["Water"."Tea"]}
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Not so good, because you have to have the front end corresponding to the related field, eat, eat; I can’t drink anything.
It is best to return:

[{"name":"Eat"."list": ["Rice"."Wheat"] {},"name":"Drink"."list": ["Water"."Tea"]}]
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Create directory 0777, mkdir, chmod

Creating a folder using mkdir on Windows works fine, but creating a folder using mkdir on Linux does not have the maximum permission 0777. So use the chmod function again, (chmod function for Linux does not have permission to create folders).

// Create a directory if it does not exist
$filePath = '.. /file/20900101';
if(@! file_exists($filePath)){
    mkdir($filePath.0777.true);
    chmod($filePath.0777);
}
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19. Reference assignments in foreach

code

$temp= [['id'= >1.'name'= >'name1'.'age'= >'age1'.'time'= >'time1' ],
            [ 'id'= >2.'name'= >'name2'.'age'= >'age2'.'time'= >'time2']].Delete the original data
$data = $temp;
foreach ($data as &$value) {$value = [];
}
echo '<pre>';
print_r($data);

Reset the original data
$data = $temp;
foreach ($data as &$value) {$value = [
        'hobby'= >1
    ];
}
print_r($data);

# append original data
$data = $temp;
foreach ($data as &$value) {$value['hobby'] = 1;
}
print_r($data);
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Array([0] = >Array(to)1] = >Array())Array([0] = >Array
        (
            [hobby] => 1
        )

    [1] = >Array
        (
            [hobby] => 1))Array([0] = >Array
        (
            [id] => 1
            [name] => name1
            [age] => age1
            [time] => time1
            [hobby] => 1
        )

    [1] = >Array
        (
            [id] => 2
            [name] => name2
            [age] => age2
            [time] => time2
            [hobby] => 1))Copy the code

20. Url generator

public function test() {
	$url = self::getUrl('http://www.test.com'['id'= >3.'other'= >'good']);
	echo $url . '<br>';     / / print: http://www.test.com?id=3&other=%E5%A5%BD%E7%9A%84
	echo urldecode($url);   // Print: http://www.test.com?id=3&other= ok
}

public function getUrl($apiUrl.$param = []){
    $param = http_build_query($param);
    return $apiUrl . '? ' . $param;
}
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Write interface empty array returns object form

$dataIs emptyStrong to objectAfter type,json_encodeThe value is{}.If it's not strong, it's==[]==, whether you need to turn to the actual situation

$data = $data ? $data : (object)$data;
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PHP common methods (update periodically)

1. Solve cross-domain problems

2, jSON_encode Chinese do not transcode

3, two-dimensional array sort

If PHP. Ini is closed on Linux server, result 406,500. Error information is printed.

5. Use of list

6. Use of array_column()

Delete 0,null, index reset

Convert seconds to minutes

9. Interface return

10, round to keep 2 decimal places.

11. Hide the middle four digits of your phone number.

12. Newline variable PHP_EOL

Isset (), array_key_exists(), empty()

14, introduce js file, with parameters? _ = 1553829159194

15. Interface testing tools

16. If the last word is “area”, delete it.

17. Assume the page content is as follows:

Create directory 0777, mkdir, chmod

19. Reference assignments in foreach

20. Url generator

Write interface empty array returns object form

PHP common methods (update periodically)

1. Solve cross-domain problems

2, jSON_encode Chinese do not transcode

3, two-dimensional array sort

If PHP. Ini is closed on Linux server, result 406,500. Error information is printed.

5. Use of list

6. Use of array_column()

Delete 0,null, index reset

Convert seconds to minutes

9. Interface return

10, round to keep 2 decimal places.

11. Hide the middle four digits of your phone number.

12. Newline variable PHP_EOL

Isset (), array_key_exists(), empty()

14, introduce js file, with parameters? _ = 1553829159194

15. Interface testing tools

16. If the last word is “area”, delete it.

17. Assume the page content is as follows:

Create directory 0777, mkdir, chmod

19. Reference assignments in foreach

20. Url generator

Write interface empty array returns object form

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