控制结构php和控制结构之间的差异javascript [关闭]

Question

You know what are the differences between the control structure in Javascript and control structure in PHP? Both use the if / else, for or while, but that vary in that change?

Are two different programming languages ​​but there are differences in the part of "control structure" in the syntax although both are similar.

Examples

Javascript control structure

<script type="text/javascript">
    var a = 5;
    var b = 8;

    if (a < b)
    {
        alert(a +" is smaller than " +b);
    }

</script>

PHP control structure

<?php
    // Number comparison
    $a = 5;
    $b = 8;

    if ($a < $b)
    {
        echo $a ."is smaller than" .$b;
    }                
    // Result : 5 is smaller than 8
?>

Thanks

Answer 1

Öhm, there are many big differences. The most important thing is that JavaScript runs on client side through your browser and PHP runs on server side. For PHP you need a webserver with a PHP module to understand that type of script.

PHP code stays on the server. If you ran your PHP side the server will send you the through PHP generated HTML. The JavaScript code will be send together with this HTML to the client/Browser and after it it will be called...

With PHP you can read your Database. With JavaScript (client-side) you can make an AJAX call to your server where a PHP script reads your Database and returns the data. Update: But JavaScript could also run server-side and then read your Database.

PHP is often used to generate HTML. JavaScript is often used to manipulate/animate HTML.