- substr: documentation ( source)
- strpos: documentation ( source)
<?php
$utf8string = "zzz\n3D打印第一互动平台-----南极熊3D打印网www.nanjixiong.com 。下载“南极熊3D打印”手机软件APP,得3D打印精美礼品。\n";
$var = '3D打印第一互动平台-----南极熊3D打印网www.nanjixiong.com';
$pos = strpos($utf8string, $var);
if ($pos!==false) {
echo substr($utf8string, 0, $pos);
}