This article will share with you some commonly used techniques and methods in actual PHP development, so that everyone can spend more time fishing. Come and collect and learn!
1. Solve cross-domain problems
public function __construct()
{
parent::__construct();
header('Access-Control-Allow-Origin:*'); //跨域
}2.json_encode Chinese No transcoding
die( json_encode( $result,JSON_UNESCAPED_UNICODE ) );
3. Two-dimensional array sorting
$users = array(
array('name' => 'xiao1', 'age' => 20),
array('name' => 'xiao2', 'age' => 18),
array('name' => 'xiao3', 'age' => 22)
);
/*按照年龄升序*/
//要将age提取出来存储到一维数组里，然后按照age升序排列
$ages= array_column($users, 'age');
array_multisort($ages, SORT_ASC, $users);
/*先按照年龄升序，再按照姓名降序*/
$ages= array_column($users, 'age');
$names = array_column($users, 'name');
array_multisort($ages, SORT_ASC, $names, SORT_DESC, $users);4. If php.ini on the Linux server closed the error prompt, resulting in results of 406, 500. Print error message.
ini_set("display_errors", "On");
error_reporting(E_ALL | E_STRICT);5. The use of list
//list使用
public function test(){
list($name, $sex) = $this->getInfo();
echo "姓名：{$name}，性别：{$sex}";
}
public function getInfo(){
return ['张三', '男'];
}
//输出：姓名：张三，性别：男6. The use of function array_column() Use
$array = [
['id'=>'99', 'name'=>'九十九'],
['id'=>'88', 'name'=>'八十八'],
['id'=>'77', 'name'=>'七十七'],
];
$arr1 = array_column($array, 'name');
//输出：array (0 => '九十九',1 => '八十八',2 => '七十七',)
$arr2 = array_column($array, 'name', 'id');
//输出：array ( 99 => '九十九', 88 => '八十八', 77 => '七十七',)array_column() with array_combine()
$ids = array_column($array, 'id');
$arrayCombine = array_combine($ids, $array);
/*$arrayCombine 输出:
array (
99 => array ( 'id' => '99', 'name' => '九十九', ),
88 => array ( 'id' => '88', 'name' => '八十八', ),
77 => array ( 'id' => '77', 'name' => '七十七', ),
)*/7, One-dimensional array deduplication, 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]))); //去除0,null;去重 var_export($array); /*输出： array ( 0 => 1, 1 => 2, 2 => 3, 3 => 4, ) */
8. Convert seconds to hours, minutes and seconds
$r = gmstrftime('%H:%M:%S',(3600*23)+123); var_export($r); //输出： '23:02:03'
9. The interface returns
10. Round to 2 decimal places.
round($x, 2);
11. Hide the middle 4 digits of your mobile phone number.
$num = "13711111111"; $str = substr_replace($num,'****',3,4);
12. Line break variable PHP_EOL
Usage scenario: A small line break actually works on different platforms There are different implementations.
Originally, /n is used to replace line breaks in the Unix world, but in order to reflect the difference, Windows uses /r/n. What is more interesting is that /r is used in Mac.
PHP_EOL is a variable that has been defined in php, representing the newline character of php.
This variable will change according to the platform. It will be /r/n under windows, /n under linux, and /r under mac.
13. PHP determines whether the array key exists isset(), array_key_exists(), empty()
$array = ['a'=>'我是第一个', 'b'=>'我是第二个', 'c'=>'我是第三个', 'f' => null];
if(isset($array['a'])) {
echo 'a存在 ';
} else {
echo 'a不存在 ';
}
if(array_key_exists('d', $array)) {
echo 'd存在 ';
} else {
echo 'd不存在 ';
}
if (empty($array['f'])) {
echo 'f不存在';
} else {
echo 'f存在,且不为 null,0,"0",false';
}
//a存在 d不存在 f不存在14. Import js files with parameters?_=1553829159194
Sometimes there are such parameters after some addresses ?_=1553829159194
15. Interface testing tool
16. If the last word is "区", delete it.
$distName = '南山区';
$lastChar = mb_substr($distName, -1);
if($lastChar=='区'){
$lastChar = mb_substr($distName, 0, -1);
}
echo $lastChar;17. Assume that the page content is as follows:
{"eat":["大米","小麦"],"drink":["水","茶"]}It’s not good, so the front end needs to correspond to the relevant fields, eat is for eating; drink is for drinking.
It is best to return like this:
[{"name":"吃的","list":["大米","小麦"]},{"name":"喝的","list":["水","茶"]}]18. Create the 0777 directory, use mkdir and chmod together
//若目录不存在则创建目录
$filePath = '../file/20900101';
if(@!file_exists($filePath)){
mkdir($filePath, 0777, true);
chmod($filePath, 0777);
}19. Reference assignment in foreach
$temp = [
[ 'id' => 1, 'name' => 'name1', 'age' => 'age1', 'time' => 'time1' ],
[ 'id' => 2, 'name' => 'name2', 'age' => 'age2', 'time' => 'time2' ]
];
# 清空原数据
$data = $temp;
foreach ($data as &$value){
$value = [];
}
echo '<pre class="brush:php;toolbar:false">';
print_r($data);
# 重置原数据
$data = $temp;
foreach ($data as &$value){
$value = [
'hobby' => 1
];
}
print_r($data);
# 追加原数据
$data = $temp;
foreach ($data as &$value){
$value['hobby'] = 1;
}
print_r($data);Array
(
[0] => Array
(
)
[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
)
)20, url generator
public function test() {
$url = self::getUrl('http://www.test.com', ['id' => 3, 'other' => '好的']);
echo $url . '<br>'; //打印：http://www.test.com?id=3&other=%E5%A5%BD%E7%9A%84
echo urldecode($url); //打印：http://www.test.com?id=3&other=好的
}
public function getUrl($apiUrl, $param = []){
$param = http_build_query($param);
return $apiUrl . '?' . $param;
}21 , the write interface empty array returns the object form
$data is emptyAfter being forced to the object type, The value of json_encode is {}, if is not forced to be converted, it will be ==[]==, whether it is necessary to be forced to be converted depends on the actual situation$data = $data ? $data : (object)$data;
Original address: https://juejin.cn/post/6973956902094897189 (updated from time to time)
Author: The motivated Dongbo Snow Eagle
Recommended learning: "PHP Video Tutorial"
The above is the detailed content of 20+ common PHP tips worth collecting (share). For more information, please follow other related articles on the PHP Chinese website!
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