PHP4 User Manual: Data Types-arrays_PHP Tutorial

Arrays
An array in PHP is actually an ordered map. A mapping maps values ​​to keywords. This type is optimized over individual methods and you can use it as a real array or a list (vector), hashtable (an implementation of a map), dictionary, aggregate, stack, queue and more. Since you may have another PHP-array as a value, you can also emulate a tree structure very easily.
Explanation of this structure is beyond the scope of this manual, but you will find a minimal example of this structure. For more information about this structure, please consult other literature. Syntax Use Website Construction Server Script Class PHPPHP User Manual fancyfunction.array.html>array() to specify an array
An array can be constructed by array(). It consists of a pair of key => value and a series of numbers separated by commas.
A key is any non-negative integer or a string. If a is expressed by a standard non-negative integer, it will be interpreted as such (i.e. 8 will be interpreted as 8, 08 will be interpreted as 08).

A value can be arbitrary.
Ignore keys. If you omit a key, the new key will be with the largest integer index plus one. If the integer index does not exist either, this key will be 0. If you have assigned a value to a key, this will be overwritten.
array( [key =

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