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This article introduces PHP how to check the existence of a value in _ array function in the array, the content is very detailed, interested friends can refer to, hope to be helpful to you.

The PHP in_array () function checks whether a value exists in the array and returns TRUE if so, FALSE otherwise.

Syntax:

Bool in_array (mixed needle, array array [, bool strict])

Parameter description:

Parameter indicates the value that needle needs to search in the array. If it is a string, the array strict to be retrieved by case-sensitive array is optional. If set to TRUE, the value types in needle and array are also checked.

Example:

The output of the example is as follows:

An example of strict checking of the character an in the $arr_a array:

The output of the example is as follows:

The character 1 does not exist in the $arr_a array as an example of needle:

The output of the example is as follows:

The array $arr_b exists in the $arr_a array

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