How to use continue in php

In PHP, the continue keyword is used in a loop structure. It can control the program to abandon the code after the continue statement in this loop and proceed to the next loop; continue can also accept an optional numeric parameter. To decide how many loops to skip to the end of the loop, the default value is 1, which means jumping to the end of the current loop.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

continue is used in the loop structure, it You can control the program to abandon the code after the continue statement in this loop and proceed to the next loop. continue itself does not jump out of the loop structure, it just gives up the loop this time. If you use continue in a non-looping structure (such as an if or switch statement), your program will error.

The difference between the continue keyword and the break keyword is that the continue keyword only ends the current loop, while the break keyword will terminate the execution of the entire loop.

The execution flow of the continue keyword is shown in the figure below:

[Example] Use a for loop to output all numbers between 1~10. When the number When it is an even number, skip the current loop. The implementation code is as follows:

<?php
    for ($i = 1; $i <= 10; $i++) {
        if($i % 2 == 0) {
            continue;
        }
        echo &#39;$i = &#39;.$i.&#39;, <br>&#39;;
    }
?>

The running result is as follows:

$i = 1,
$i = 3,
$i = 5,
$i = 7,
$i = 9,

Same as the break keyword, continue can also accept an optional numeric parameter to decide to skip. At the end of several loops, the default value is 1, which means jumping to the end of the current loop. The syntax format is as follows:

continue n;

The sample code is as follows:

<?php
    $arr = array(&#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;,&#39;E&#39;,&#39;F&#39;,&#39;G&#39;,&#39;H&#39;,&#39;I&#39;,&#39;J&#39;);
    for ($i=0; $i < 10; $i++) {
        echo &#39;<br>&#39;;
        if($i % 2 == 0){
            continue;
        }
        for (;;) {
            for ($j=0; $j < count($arr); $j++) {
                if($j == $i){
                    continue 3;
                }else{
                    echo &#39;$arr[&#39;.$j.&#39;] = &#39;.$arr[$j].&#39; | &#39;;
                }
            }
        }
        echo "由于前面跳出了循环，所以这句换无法打印出来！";
    }
?>

The running results are as shown below:

Recommended learning: "PHP video tutorial》

The above is the detailed content of How to use continue in php. For more information, please follow other related articles on the PHP Chinese website!