php将12小时制转换成24小时制的方法

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<?php

function to_24_hour($hours,$minutes,$seconds,$meridiem){

$hours = sprintf('%02d',(int) $hours);

$minutes = sprintf('%02d',(int) $minutes);

$seconds = sprintf('%02d',(int) $seconds);

$meridiem = (strtolower($meridiem)=='am') ? 'am' : 'pm';

return date('H:i:s', strtotime("{$hours}:{$minutes}:{$seconds}{$meridiem}"));

}

echo to_24_hour( 1, 2, 3, 'pm' ); // Returns 13:02:03

echo to_24_hour( '02', '30', '00', 'pm' ); // Returns 14:30:00

?>