PHP Programing language

Introduction to PHP

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Syntax In PHP

Variable Types In PHP

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Operator In PHP

Decision Making In PHP

Loop Types In PHP

Arrays In PHP

Arrays function

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string function

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Forms In PHP

File Handling In PHP

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Exception In PHP

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PHP Zip

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Arrays function

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SQL In PHP

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PHP Magic-Quotes

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PHP Basic Tutorials With MySQL

PHP subjective question

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PHP FAQS

array_keys()

The array_keys() function returns an array containing the keys.

array_keys(array,value,strict)

In above syntax,"array" specifies an array, "value" specifies the value then only the keys with this value are returned, "strict" is used with the value parameter and values are as follows:

• true - Returns the keys with the specified value, depending on type: the number 5 is not the same as the string "5".
• false - Default value. Not depending on type, the number 5 is the same as the string "5".

Example:

<?php
$a=array("Apple"=>"fruit","Mango"=>"fruit","Banana"=>"fruit");
print_r(array_keys($a));
?>

Output: