Redirecting stdout and stderr to log file

For several scripts run by cron on a linux/mysql system, I'd like to log all stdout and stderr output to a file. I'm currently using this code to manually write to a log file:

$scriptName = "checkStores"; # For checkStores.php
$logPath = "/usr/local/company/bin/logs/";
$logPathAndFile = $logPath . $scriptName . ".log";
$logStart = "\n\n----" . date("Y-m-d H:i:s") . "----\nLog entry for " . $scriptName . ".php\n";
if (!$log = fopen($logPathAndFile,"a")) { echo "Cannot open log file [$logFile]\n"; }
if (!fwrite($log, $logStart)) { echo "Cannot write to log file [$logFile]\n"; }

This works, but all log entries are manual and stderr output goes to the system log. Is there a way to redirect all stdout and stderr to a log file?

Here's perl code I've recently used to log everything (stdout and stderr) to a file. An equivalent function in php is what I'm trying to build.

sub createLog
{
my $logFile = shift;
open ( STDERR, ">>$logFile" );
open ( STDOUT, ">>$logFile" );
open LOG, ">>$logFile" || die "$0: Can't open log file!";
select( LOG );
$| = 1; # Turn on buffer autoflush for log output
print "$0: Starting script ...\n";
select( STDOUT );
}

I know that one can redirect I/O from the shell, but I'd prefer to so do this within each php script.

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