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Today, I would like to share with you the relevant knowledge points about how php removes the healthy value of the array. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

In PHP, you can use the array_keys () function to remove the healthy value of an array, which can get and return only some or all of the key names of the array, with the syntax "array_keys ($array,$value,$strict)".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In PHP, you can use the array_keys () function to remove healthy values from an array.

The array_keys () function can get some or all the key names in the array.

Syntax:

Array_keys ($array,$value,$strict)

The parameters are described as follows:

$array: required parameter, which is the array to be operated

$value: optional parameter. If the argument is empty, the function will return all the key names in the array. If this parameter is specified, the function will only return the key name with the value of $value

$strict: optional parameter to determine whether strict mode is used when searching. $strict defaults to false, that is, non-strict mode. When searching, only types are compared, not types. If $strict is set to true, strict mode, value and type are compared at the same time when searching, which is equivalent to = =.

The array_key () function returns the resulting array key name as an array.

Example:

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