Code that PHP detects if the URL address and HTTP address format are valid

Source: Internet
Author: User
    1. /**
    2. DESC: Check network address format is valid
    3. link:bbs.it-home.org
    4. Date:2013/2/24
    5. */
    6. function Checkurl ($weburl)
    7. {
    8. Return!ereg ("^http (s) *://[_a-za-z0-9-]+ (. [ _a-za-z0-9-]+) *$ ", $weburl);
    9. }?>
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2. Determine if the HTTP address is valid

    1. /**

    2. DESC: Detect If HTTP address is valid
    3. link:bbs.it-home.org
    4. Date:2013/2/24
    5. */
    6. function Url_exists ($url)
    7. {
    8. $ch = Curl_init ();
    9. curl_setopt ($ch, Curlopt_url, $url);
    10. curl_setopt ($ch, curlopt_nobody, 1); Do not download
    11. curl_setopt ($ch, Curlopt_failonerror, 1);
    12. curl_setopt ($ch, Curlopt_returntransfer, 1);
    13. Return (Curl_exec ($ch)!==false)? True:false;
    14. }

    15. Method 2

    16. function Img_exists ($url)
    17. {
    18. Return file_get_contents ($url, 0,null,0,1)? True:false;
    19. }

    20. Method 3:

    21. function Url_exists ($url)
    22. {
    23. $head = @get_headers ($url);
    24. Return Is_array ($head)? True:false;
    25. }?>

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Invocation Example:

    1. $url = ' http://bbs.it-home.org ';
    2. echo url_exists ($url);
    3. ?>
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