Here is an example for php processes:
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<br><span class=span_content_bash>while :; do ps -eo "%p %x %a"|grep [b]in/php;sleep 0.5; done</span>
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<br>Here is a more luxurious version, that prefixes each line with the current time and logs the output to a file:
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<br><span class=span_content_bash><pre>while sleep 1; do ps -eo "%p %x %a"|awk '/bin\/php/ {system("printf %s\\  $(date +\"%Y-%m-%d_%H:%M:%S\")");print}';done | tee -a processes.txt</pre></span>
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<br>In the last one, please be aware that there are 2 whitespaces after "%s\\". The command will fail, if there is only one.