php 字符串 包含 比较 替换

if(strpos($str,??'ok') !== false) {?

?? //包含

}

?

?

//错误的方法

?

?

<?php$url1="http://www.163.com";$url2="www.163.com";$url3="xxxxhttp://www.163.com";$rooturl="xxx";echo "".strrpos($url1,"http://")."\n";echo "".strrpos($url2,"http://")."\n";echo "".strrpos($url3,"http://")."\n";if(strrpos($url1,"http://")!==false && strrpos($url1,"http://")==0){echo str_ireplace("http://","",$url1)."__1 have \n";}if(strrpos($url2,"http://")!==false && strrpos($url2,"http://")==0){echo "2 have \n";}if(strrpos($url3,"http://")!==false && strrpos($url3,"http://")==0){echo "3 have \n";}echo "".$rooturl."\n";?>?