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Array function library: Array_keys

Source: Internet
Author: User
Keywords array_keys php Chinese function manual array function library
Tags aliyun array array function library array_keys function function library html http
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Array_keys

(PHP4)

Array_keys---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Returns all index values for an array

Syntax: array array_keys (array input [, mixed search_value]);

Description:

This function returns the index value of the number and string from the parameter input, and the parameter search_value is not required and returns all index values from input, if specified, returning only the index value of the specified value.

Example:

<?php

$array = Array (0 =>, "color" => "red");

Array_keys ($array); Returns Array (0, "color")

$array = Array (1, 100, 2, 100);

Array_keys ($array, 100); Returns Array (0, 2)

?>

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Related Keywords:
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