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Array search can be performed in php. PHP provides two array search functions: 1. array_search(), which can search for a given value in the array and return the corresponding key name. The syntax "array_search (search value, array, whether to compare types when searching)" returns The value is of string type; 2. array_keys(), used to search for a given value in the array and return the corresponding key name. The syntax is "array_keys (array, search value, comparison type)", and the return value is an array type.
The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer
Array search can be performed in php.
There are two array search functions provided in php:
array_search()
array_keys()
Both functions can search for a given value in an array and return the corresponding key name (subscript). The difference is: the return value of array_search() is of string type, while the return value of array_keys() is of array type.
1. Use array_search() for array search
array_search() function searches for a key value in the array and returns the corresponding key name.
array_search(value,array,strict)
| Parameters | Description |
|---|---|
| value | Required . Specifies the key value to search for in the array. |
| array | Required. Specifies the array to be searched. |
| strict | Optional. If this parameter is set to TRUE, the function searches the array for elements of the same data type and value. Possible values:
|
Example: Search for the key value "red" in the array and return its key name
<?php
header("Content-type:text/html;charset=utf-8");
$a=array("a"=>"red","b"=>"green","c"=>"blue");
var_dump($a);
echo array_search("red",$a);
?>
2. Use array_keys() for array search
array_key() function can obtain some or all key names in the array.
array_keys(array,value,strict)
Array search can only be performed when the value parameter is set,
| Parameter | Description |
|---|---|
| array | Required. Specifies an array. |
| value | Optional. You can specify a key value, and then only the key name corresponding to that key value will be returned. |
| strict | Optional. Used with the value parameter. Possible values:
|
Example: Search for the key value "Highlander" in the array and return its key name
<?php
header("Content-type:text/html;charset=utf-8");
$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
var_dump($a);
var_dump(array_keys($a,"Highlander"));
?>
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