Posted By

rickygri on 07/04/13

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file

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Last Edited at 07/04/13 01:22am

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If file exists function - server-side

/ Published in: PHP

This function can be used to check if a file exists using the HTTP header response. Example use, when looping through cached JSON objects (instagram API, etc.)

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<?php
 
function exists($url) {
    // Get file contents limited to one character as
    // the whole file isn't needed, only the response
    // header
    file_get_contents($url, NULL, NULL, 0, 1);
    // Parse response
    $response = $http_response_header[0];
    // Split response to isolate reponse number
    $split = explode(" ", $response);
    // Return true if 200 header response received
    if ($split[1] == "200") return true;
    // Return false if 403 (not found) received
    else if ($split[1] == "403") return false;
    // Any other response return false
    else return false;
}
 
// Example usage - Check to see if image exists using img src url
 
//$url = "http://distilleryimage8.s3.amazonaws.com/4a2813d8785e11e2893322000a1f9ca0_7asd.jpg";
$url = "http://distilleryimage8.s3.amazonaws.com/4a2813d8785e11e2893322000a1f9ca0_7.jpg/";
if (exists($url)) echo "image exists";
else echo "image does not exist";
 
?>