Php checks whether the site is valid

Php checks whether the URL is valid. 1 .? URL format :? FunctioncheckUrl ($ weburl) {return! Ereg (^ http (s) *: [_ a-zA-Z0-9-] + (. [_ a-zA-Z0-9-] +) * $, $ weburl );}? 2 .? Determine whether the http address is valid? Functionurl_exists php checks whether the URL is valid

1 .? URL format:

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function checkUrl($weburl) { return !ereg("^http(s)*://[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*$", $weburl); }

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2 .? Determine whether the http address is valid

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Function url_exists ($ url) {$ ch = curl_init (); curl_setopt ($ ch, CURLOPT_URL, $ url); curl_setopt ($ ch, CURLOPT_NOBODY, 1 ); // do not download curl_setopt ($ ch, CURLOPT_FAILONERROR, 1); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); return (curl_exec ($ ch )! = False )? True: false ;}

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Or

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function img_exists($url) {return file_get_contents($url,0,null,0,1) ? true : false;}

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Or

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function url_exists($url) {$head = @get_headers($url);    return is_array($head) ?  true : false;}

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Instance:

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$url='http://www.qq.com';echo url_exists($url);

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