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last-modified.php
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last-modified.php
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<?php
// After beating my head against the wall, I found this fully hashed out function that did exactly what I was trying to do.
// The function checks the cURL to find the mp3 file's last modified Timestamp, and if that comes back empty, it checks the PHP header.
// Credit: Andrew Baillie
// URI: https://github.com/andrewbaillie/Last-Modified-Date-of-URL
// Samples
// Return Timestamp
// $result_1 = remote_file_last_modified( 'https://media.publicbroadcasting.net/wjct/newscast/newscast.mp3' );
// Return Human Readable Date (Default)
// $result_2 = remote_file_last_modified( 'https://media.publicbroadcasting.net/wjct/newscast/newscast.mp3' , false );
// Return Human Readable Date (Modified)
// $result_3 = remote_file_last_modified( 'https://media.publicbroadcasting.net/wjct/newscast/newscast.mp3' , false , 'jS F Y H:ia' );
/* Function Name: remote_file_last_modified
*
* Inputs:
* $url = The URL to retreive
* $timestamp = Return a UNIX timestamp or human readable date - defaulted to Timestamp
* $date_format = Standard PHP data format string (http://php.net/manual/en/function.date.php)
*
* Output:
* On success the date/time when the url was last modified.
* On failure boolean False.
*/
function array_find($needle, array $haystack)
{
foreach ($haystack as $key => $value) {
if (false !== stripos($value, $needle)) {
return $key;
}
}
return false;
}
function remote_file_last_modified( $url , $timestamp = true, $date_format = 'd-m-Y H:i:s' ) {
$curl = curl_init();
curl_setopt( $curl , CURLOPT_URL , $url );
curl_setopt( $curl , CURLOPT_HEADER , 1 ); // Include Header In Output
curl_setopt( $curl , CURLOPT_NOBODY , 1 ); // Set to HEAD & Exclude body
curl_setopt( $curl , CURLOPT_RETURNTRANSFER , 1 ); // No Echo/Print
curl_setopt( $curl , CURLOPT_TIMEOUT , 5 ); // 5 seconds max, to get the HEAD header.
$curl_result = curl_exec( $curl ); // Execute
// Check for curl result
if ( $curl_result !== FALSE ) {
// Separate the header into it's individual lines
$headers = explode( "\n" , $curl_result );
// find the index key of the last modified timestamp in the array
$needle = 'Last-Modified: ';
$myindex = array_find($needle, $headers);
// Extract the last modified date from the headers
// $last_modified = explode( 'Last-Modified: ' , $headers[5] );
$last_modified = explode( 'Last-Modified: ' , $headers[$myindex] );
// Return the data in the required format
if ( $timestamp ) {
return strtotime( $last_modified[1] );
} else {
return date( $date_format , strtotime( $last_modified[1] ) );
}
}
// Return false on error
return FALSE;
}