How to call php from js

How to call php from js: first create a code sample file; then implement it in js through the statement "" Just call it.

The operating environment of this tutorial: Windows 7 system, PHP version 5.6. This method is suitable for all brands of computers.

Recommended: "PHP Video Tutorial"

Examples of methods for JS to call PHP and PHP to call JS

1. JS Method to call the PHP file and obtain the value in PHP

Give a simple example to illustrate:

For example, in the page test_json1, use the following sentence to call:

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

In test_json2 There is such a piece of PHP code in .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, the test_json2.php file will be called, and the output of the b.php file will be executed 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 files in HTML to call PHP file, the output of the PHP file will be used as JS code by the calling page.

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 the method (function) in js

It is basically similar to the second case, using echo script to implement JS call

<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 functions

<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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