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Data Types of Array Keys in PHP
What Types of Data Can Be Used as Array Keys in PHP?
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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[""] = Basic
Note that an empty string can also be used as a key.
⇒ Index of Array Values in PHP
⇐ Retrieving Values out of an Array in PHP
2017-02-03, 2150🔥, 0💬
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