Parse Magento log files and return a combined count of each error.

log_parse.php

<?php
// Parse error log file
echo '------------------------------- exception.log -------------------------------';
$lines = file('exception.log');

$error = '';
$errors = array();
$errors_count = array();
foreach ($lines as $line_num => $line) {
	$line = trim($line);
	if (preg_match('/[0-9]{4}\-[0-9]{2}\-[0-9]{2}T[0-9]{2}\:[0-9]{2}\:[0-9]{2}\+[0-9]{2}\:[0-9]{2} .+/si', $line) && !empty($error)) {
		$code = base64_encode($error);
		$errors[$code] = $error;

		if (!isset($errors_count[$code])) {
			$errors_count[$code] = 0;
		}
		$errors_count[$code]++;
		$error = preg_replace('/[0-9]{4}\-[0-9]{2}\-[0-9]{2}T[0-9]{2}\:[0-9]{2}\:[0-9]{2}\+[0-9]{2}\:[0-9]{2} (.+)/si', '$1', $line);
	} else {
		$error .= $line.PHP_EOL;
	}
}

if (!empty($error)) {
	$errors[base64_encode($error)] = $error;
}

foreach ($errors as $code => $error) {
	echo $errors_count[$code].' => '.$error.PHP_EOL;
}


// Parse system log file
echo '------------------------------- system.log -------------------------------';
$lines = file('system.log');

$error = '';
$errors = array();
$errors_count = array();
foreach ($lines as $line_num => $line) {
	$line = trim($line);
        if (preg_match('/[0-9]{4}\-[0-9]{2}\-[0-9]{2}T[0-9]{2}\:[0-9]{2}\:[0-9]{2}\+[0-9]{2}\:[0-9]{2} .+/si', $line) && !empty($error)) {
                $code = base64_encode($error);
                $errors[$code] = $error;

                if (!isset($errors_count[$code])) {
                        $errors_count[$code] = 0;
                }
                $errors_count[$code]++;
                $error = preg_replace('/[0-9]{4}\-[0-9]{2}\-[0-9]{2}T[0-9]{2}\:[0-9]{2}\:[0-9]{2}\+[0-9]{2}\:[0-9]{2} (.+)/si', '$1', $line);
        } else {
                $error .= $line.PHP_EOL;
        }
}

if (!empty($error)) {
        $errors[base64_encode($error)] = $error;
}

foreach ($errors as $code => $error) {
        echo $errors_count[$code].' => '.$error.PHP_EOL;
}