PHP Array Operations-delete specified array elements _php tutorial

This article condensed the use of various functions of PHP to achieve the specified element value to remove the array elements, the need for friends can refer to.

Removes an array element by the specified element value

The code is as follows	Copy Code
$a =array ("a" = "Dog", "b" = "Cat", "C" and "Horse"); Print_r ($a); unset ($a [Array_search ("Cat", $a)]); Array_search ("Cat", $a) returns the key name by element value. Keep index after removal Print_r ($a); ?>

The following is about Array_search usage

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The code is as follows	Copy Code
Before removal: Array ( [A] = Dog [B] = Cat [C] = Horse ) After removal: Array ( [A] = Dog [C] = Horse )

Array_search () Definition and usage
The Array_search () function, like In_array (), looks for a key value in the array. If the value is found, the key name of the matching element is returned. Returns False if it is not found.

Before PHP 4.2.0, the function returned null instead of false on failure.

If the third parameter, strict, is specified as true, the key name of the corresponding element is returned only if the data type and value are consistent.

Grammar
Array_search (value,array,strict) parameter description
Value is required. Specifies the value to search for in the array.
Array required. The array to be searched.
Strict is optional. Possible values:

True
False-Default
If the value is set to True, the type of the given value is also checked in the array. (see Example 2)

Example 1

The code is as follows	Copy Code
$a =array ("a" = "Dog", "b" = "Cat", "C" and "Horse"); Echo Array_search ("Dog", $a); ?> output:

A

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