How does php query whether a value in an array exists?

This article mainly introduces the relevant knowledge of php how to query the existence of a value in the array, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this php how to query the existence of a certain value in the array. Let's take a look.

Query the existence of the method: 1, use in_array () function, syntax "in_array (value, $array)"; 2, use array_search () function, syntax "array_search (value, $array)".

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

Php queries whether a value value exists in the array

Method 1: use the in_array () function

The in_array () function looks up whether a value is included in the array, returns TRUE if it exists, or FALSE if it doesn't exist. The syntax format is as follows:

In_array ($needle, $array [, $strict = FALSE])

The parameters are described as follows:

$needle: the value to be searched. If $needle is a string, it is case-sensitive when comparing.

$array: the array to be searched

$strict: optional parameter. Default is FALSE.

If $strict is empty or FALSE, the in_array () function simply checks whether the value of $needle is equal to the value in $array

If the value of $strict is TRUE,in_array (), the function not only checks the values in $needle and $array, but also compares whether their types are equal.

Example:

Method 2: use the array_search () function

The array_search () function searches the array for a key value, and returns the corresponding key name if the specified key value is found in the array, otherwise it returns FALSE. The syntax format is as follows:

Array_search (value,array,strict)

Value is required. Specifies the key value to search in the array.

Array is required. Specifies the array to be searched.

Strict is optional. If this parameter is set to TRUE, the function searches the array for elements with the same data type and value. Possible values:

If set to true, the type of the given value is checked in the array, and the number 5 is different from the string 5 (see example 2).

True

False-default

If the key value is found more than once in the array, the key name that matches the first found key value is returned.

Example:

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