Examples of how JS calls PHP and PHP calls JS

Examples of how JS calls PHP and PHP calls JS

When learning any programming language, we will hear the word call. So, how to call php in javascript? Can js also be called in php? Let us take a look below.

1. Call the PHP file using JS and obtain the value in PHP## A simple example to illustrate:
For example, in the page test_json1
, uses 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_json## There is such a piece of PHP code in #2.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 executed

test_json1.php file, 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 the file in HTML to call the PHP file, then the output of the PHP file will be used by the calling page as JS code.

2. PHP calls the value in JS
There is such a piece of code in the test_js
on3.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 jsIt 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 variable

(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>

Thank you everyone for reading, I hope you will benefit a lot.

This article is reproduced from: https://blog.csdn.net/wxg694175346/article/details/8592571

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