array_keys

PHP array_keys()函數 (PHP array_keys() function)

array_keys() function is used to get the keys of an array, it accepts an array as an argument and returns a new array containing keys.

array_keys()函數用于獲取數組的鍵，它接受一個數組作為參數并返回一個包含鍵的新數組。

Syntax:

句法：

array_keys(input_array, [value], [strict]);

Here,

這里，

• input_array is an array (i.e. input array).

  input_array是一個數組(即輸入數組)。

• value is an optional parameter, it is used to define a value if the value is defined, then the only keys having that value are returned.

  value是一個可選參數，如果定義了值，則用于定義值，然后僅返回具有該值的鍵。

• strict is also an optional parameter, it is default set to false if we set it true the type of values will be checked.

  嚴格也是一個可選的參數，它是默認設置為false，如果我們把它真值的類型將被檢查。

Examples:

例子：

Input:$per = array("name" => "Amit", "age" => 21, "gender" => "Male");Output:Array ([0] => name [1] => age [2] => gender )

PHP code 1: array with and without containing keys

PHP代碼1：包含和不包含鍵的數組

<?php$per = array("name" => "Amit", "age" => 21, "gender" => "Male");print ("keys array...\n");print_r (array_keys($per));//array with out keys $arr = array("Hello", "world", 100, 200, -10);print ("keys array...\n");print_r (array_keys($arr)); ?>

Output

輸出量

keys array... Array ([0] => name [1] => age [2] => gender ) keys array... Array ([0] => 0[1] => 1[2] => 2[3] => 3[4] => 4 )

PHP code 2: Using value and strict mode

PHP代碼2：使用值和嚴格模式

<?php$arr = array("101" => 100, "102" => "100", "103" => 200);print("output (default function call)...\n");print_r (array_keys($arr)); print("output (with checking value)...\n");print_r (array_keys($arr, 100)); print("output (with checking value & strict mode)...\n");print_r (array_keys($arr, 100, true)); ?>

Output

輸出量

output (default function call)... Array ( [0] => 101[1] => 102[2] => 103 ) output (with checking value)... Array ( [0] => 101[1] => 102 ) output (with checking value & strict mode)... Array ( [0] => 101 )

翻譯自: https://www.includehelp.com/php/array_keys-function-with-example.aspx

array_keys

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