shell command to restart an php program [closed]

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I need to restart my php program when the memory of the program exceeds 500mb. Can it be done by any script in php or in shell?

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Run your PHP script like this:

php -d "memory_limit=500M" myscript.php

And do it forever:

while true; do php -d "memory_limit=500M" myscript.php; done

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Whenever I deal with long-running programs, I like to include some basic tools for checking whether they are active, what errors they are creating, etc. Here's a quick script I run with cron to make sure that my gearman workers are running.

$program = 'program.php';  

// Run the cmd to get list of running programs  
exec( "ps aux | grep $program | awk '{print $12}'", $output );  

if( count($output) == 0 )  
    exec( "php $program > /dev/null &" );

Of course, you may not want the output of your script sent to /dev/null. In fact, if you're having problems with memory usage, you may want to use the >> operator to capture your script's output in a makeshift log.