Loops

A loop is a control structure that allows you to execute a block of code repeatedly based on a specified condition. Loops are essential for automating repetitive tasks and processing arrays or collections of data. PHP provides several types of loops, including: for, while, do…while and foreach.

The most popular loop is foreach().

Loops may hide in certain functions : for example, array_map() and array_walk() apply a method to every element in an array.

Generators are closely related to the foreach() loop.

<?php

foreach([11,12,13] as $id => $value) {
    print "$id => $value\n";
}

for ($i = 1; $i <= 10; $i++) {
    echo $i;
}

$i = 10;
while ($i <= 10) {
    echo $i++;
}

$i = 10;
do {
    echo $i++;
} while ($i <= 10);

?>

Documentation

Related : Do While, While, Break, Control Flow, Dangling Reference, Do While, For, Foreach, N+1 Query Problem