How to call php method in javascript

How to call php via javascript: first create an HTML sample file and a PHP sample file; then add a script tag to the HTML; finally call the PHP method in js through "alert(jstext);".

The operating environment of this article: windows7 system, php5.3.5 version, DELL G3 computer

JS calls PHP and PHP calls JS Method example

1. Call the PHP file in JS mode and obtain the value in PHP

Give a simple example to illustrate:

For example, use it in the page test_json1 The following call:

<script type="text/javascript" src="http://callmewhy.sinaapp.com/index.php/test/testjson2">
</script>
<script type="text/javascript" >
    alert(jstext);
</script>

There is such a piece of PHP code in test_json2.php:

<?php
$php_test=&#39;I come from PHP!&#39;;
echo "var test=&#39;$php_test&#39;;";
echo "var jstext="."&#39;$php_test&#39;;"; 
?>

When the test_json1.php file is executed, test_json2.php will be called file, and execute the output of the b.php file as a JS statement,

So a prompt box will pop up here, the content is the value of the JS variable jstext, which is the value assigned to jstext in the PHP file .

Summary: Use JS to call the file in HTML to call the PHP file, then the output of the PHP file will be used as JS code by the calling page.

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2. PHP calls the value in JS

There is such a piece of code in the test_json3.php page:

<script type="text/javascript" > 
var data="call_me_why"; 
</script>
<? 
echo "<script type=text/javascript>document.write(data)</script>";
?>

3 , PHP calls methods (functions) in js

is basically similar to the second case, using echo scripts to implement JS calls

<script type="text/javascript"> 
function test() {   
var t1=3;   
t1 = t1+2;   
alert(t1);   
//return t1; 
} 
</script>
<?php echo "<script type=&#39;text/javascript&#39;>test();</script>"; ?>

4. JS calls PHP variables

(1)

<?php
$userId=100;
?> 
<script>
var userId;
userId=document.getElementById("userId").value;
alert(userId);
</script>
<input type="text" name="userId" id="userId" value="<?php echo $userId; ?>">

(2)

<?php
    $url = &#39;CALL_ME_WHY&#39;;    //定义变量
?>
<script type="text/javascript">
    //js调用php变量
    var ds ="<?php echo $url?>" ; //赋值
    alert(ds); //输出效果
</script>

5, JS calls PHP function

<script language="JavaScript">
var Y=<?php echo date(&#39;Y&#39;)?>,M=<?php echo date(&#39;n&#39;)?>,D=<?php echo date(&#39;j&#39;)?>;
alert(Y);
alert(M);
alert(D);
</script>

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