Syntax

• for ($i = 0; $i \< count($array); $i++) { incremental_iteration(); }
• for (i = count(array) - 1; $i >= 0; $i–) { reverse_iteration(); }
• foreach ($data as $datum) { }
• foreach ($data as $key => $datum) { }
• foreach ($data as &$datum) { }

Remarks

Comparison of methods to iterate an array

Method | Advantage | —— | ——— |foreach | The simplest method to iterate an array. |foreach by reference | Simple method to iterate and change elements of an array. |for with incremental index | Allows iterating the array in a free sequence, e.g. skipping or reversing multiple elements | Internal array pointers | It is no longer necessary to use a loop (so that it can iterate once every function call, signal receive, etc.) |