Show logs from a file that matches a regular expression

searchLog.php

<?php

/**
 * DWTFYW License
 * 
 * Author: Tony Brix, http://tonybrix.info
 * 
 * Show logs from a file that matches a regular expression. Matches multiline records.
 * @param string $file The file to search
 * @param string $search [optional] A string or regular expression to match; default = ""
 * @param boolean $isregexp [optional] A regular expression to match; default = false
 * @param datetime $startdate [optional] Only search after this date 
 * @param datetime $enddate [optional] Only search before this date
 * @param string $recordBeginning [optional] A regular expression for the beginning of a record in the file. Default
 * @return array
 */
function searchLog($file, $search = "", $isregexp = false, $startdate = null, $enddate = null, $recordBeginning = null) {
	//turn off error reporting so we aren't writing errors to the file.
	error_reporting(0);
	//set recordBeginning
	if ($recordBeginning === null) {
		$recordBeginning = "/^\[(?P<datetime>\d\d-\w\w\w-\d\d\d\d \d\d:\d\d:\d\d) (?P<timezone>" . preg_quote(date_default_timezone_get(), "/") . ")\]/";
	}
	//check startdate and enddate
	if ($startdate !== null && is_string($startdate)) {
		$startdate = strtotime($startdate);
	}
	if ($enddate !== null && is_string($enddate)) {
		$enddate = strtotime($enddate);
	}
	//get pattern to match
	if ($isregexp) {
		$pattern = "/^{$search}$/s";
	} else {
		$pattern = "/^.*" . preg_quote($search, "/") . ".*$/s";
	}

	$matchedRecords = array();
	//$notMatchedRecords = array();
	$recordNumber = 0;
	$lastRecordTime = null;
	$lastRecordTimezone = null;
	$record = $record;
	$handle = fopen($file, "r");
	if ($handle) {
		while (($buffer = fgets($handle)) !== false) {
			//check if this is the beginning of a new record.
			$matches = null;
			if (preg_match($recordBeginning, $buffer, $matches)) {
				$recordNumber++;
				//search $record
				if ($record !== null) {
					if (($startdate === null || $lastRecordTime > $startdate) && ($enddate === null || $lastRecordTime < $enddate) && preg_match($pattern, $record)) {
						$matchedRecords[] = array(
							"number" => $recordNumber,
							"time" => $lastRecordTime,
							"timezone" => $lastRecordTimezone,
							"record" => $record,
						);
					} /* else {
					  $notMatchedRecords[] = array(
					  "number" => $recordNumber,
					  "time" => $lastRecordTime,
					  "timezone" => $lastRecordTimezone,
					  "record" => $record,
					  );
					  } */
				}
				$lastRecordTime = strtotime($matches["datetime"]);
				$lastRecordTimezone = $matches["timezone"];
				$record = $buffer;
			} else {
				$record .= $buffer;
			}
		}
		//search last record
		if (($startdate === null || $lastRecordTime > $startdate) && ($enddate === null || $lastRecordTime < $enddate) && preg_match($pattern, $record)) {
			$matchedRecords[] = array(
				"number" => $recordNumber,
				"time" => $lastRecordTime,
				"timezone" => $lastRecordTimezone,
				"record" => $record,
			);
		} /* else {
		  $notMatchedRecords[] = array(
		  "number" => $recordNumber,
		  "time" => $lastRecordTime,
		  "timezone" => $lastRecordTimezone,
		  "record" => $record,
		  );
		  } */
		fclose($handle);
	}
	return array(
		"total" => $recordNumber,
		//"pattern" => $pattern,
		"records" => $matchedRecords,
		//"notmatch" => $notMatchedRecords,
	);
}