Two types of data can be used as array keys: string and integer. When a string is used as a key and the string represent an integer, PHP will convert the string into a integer and use it as the key. Here is a PHP script on different types of keys:<?php $mixed = array();$mixed["Zero"] = "PHP";$mixed[1] = "Perl";$mixed["Two"] = "Java";$mixed["3"] = "C+";$mixed[""] = "Basic";print("Array with mixed keys:\n");print_r($mixed);print("\$mixed[3] = ".$mixed[3]."\n");print("\$mixed[\"3\"] = ".$mixed["3"]."\n");print("\$mixed[\"\"] = ".$mixed[""]."\n");?>This script will print:Array with mixed keys:Array( [Zero] => PHP [1] => Perl [Two] => Java [3] => C+ [] => Basic)$mixed[3] = C+$mixed["3"] = C+$mixed[""] = BasicNote that an empty string can also be used as a key. PHP
Topic: Arrays
What Types of Data Can Be Used as Array Keys?
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