array_keys in php returns the key name of the array

The array_keys function in php is used to return a new array containing all the key names in the array. This article introduces in detail how to use the PHP array_keys function. Coders who need it can refer to

array_keys returns some or all key names in the array

Instructions

array array_keys (array $array [, mixed $search_value [, bool $strict = false ]] )

array_keys() Returns the number or string key in the $array array name.

If the optional parameter search_value is specified, only the key name of the value will be returned. Otherwise all keys in the $array array will be returned.

Detailed explanation of parameters

Return value

Returns all keys in array.

Example

The above routine will output:

Array ( [0] => 0 [1] => color ) Array ( [0] => 0 [1] => 3 [2] => 4 ) Array ( [0] => color [1] => size )

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