Ajax request error, how to enable cross-domain request in PHP

This article will introduce to you how to report an ajax request error and enable cross-domain requests in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Add

header("Access-Control-Allow-Origin: *");

If you want to To allow only a certain website to pass, you can set

header("Access-Control-Allow-Origin: http://test.com"); // Allow cross-domain requests initiated by test.com, Others will not pass

If it is a php framework, it needs to be placed after the namespace, not in front, otherwise an error will be reported

*.php

<?php 
	header(&#39;Access-Control-Allow-Origin: *&#39;);
	$arr = [
		array(&#39;id&#39;=>1,&#39;title&#39;=>&#39;one1&#39;),
		array(&#39;id&#39;=>2,&#39;title&#39;=>&#39;one2&#39;),
		array(&#39;id&#39;=>3,&#39;title&#39;=>&#39;one3&#39;),
		array(&#39;id&#39;=>4,&#39;title&#39;=>&#39;one4&#39;),
	];

	echo json_encode($arr);
 ?>

index.html

<script type="text/javascript" src="jq.js"></script>
<script type="text/javascript">
	$.ajax({
		type:&#39;post&#39;,
		url: &#39;http://127.0.0.1/demo1/api.php&#39;,
		contentType: "application/x-www-form-urlencoded",
		dataType: &#39;json&#39;,
		success: function(res){
			console.log(res)
		}
	})
</script>

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