PHP获取当前时间的毫秒数

/* * 获取时间差，毫秒级 */ function get_subtraction() { $t1 = microtime(true); $t2 = microtime(true); return (($t2-$1)*1000).'ms'; }

/* * microsecond 微秒 millisecond 毫秒 *返回时间戳的毫秒数部分 */ function get_millisecond() { list($usec, $sec) = explode(" ", microtime()); $msec=round($usec*1000); return $msec; } /* * *返回字符串的毫秒数时间戳 */ function get_total_millisecond() { $time = explode (" ", microtime () ); $time = $time [1] . ($time [0] * 1000); $time2 = explode ( ".", $time ); $time = $time2 [0]; return $time; } /* * *返回当前 Unix 时间戳和微秒数(用秒的小数表示)浮点数表示，常用来计算代码段执行时间 */ function microtime_float() { list($usec, $sec) = explode(" ", microtime()); return ((float)$usec + (float)$sec); }