PHP command line memory limit error

Very often, when data size gets bigger and bigger, some scripts will break due to default memory limit. I got the following error today.

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 72 bytes) in /someDir/myScript.php on line 15
Segmentation fault: 11

I checked my php help. I am using version 5.3.6.

$ php -h
Usage: php [options] [-f]  [--] [args...]
       php [options] -r  [--] [args...]
       php [options] [-B ] -R  [-E ] [--] [args...]
       php [options] [-B ] -F  [-E ] [--] [args...]
       php [options] -- [args...]
       php [options] -a

  -a               Run as interactive shell
  -c | Look for php.ini file in this directory
  -n               No php.ini file will be used
  -d foo[=bar]     Define INI entry foo with value 'bar'
  -e               Generate extended information for debugger/profiler
  -f         Parse and execute .
  -h               This help
  -i               PHP information
  -l               Syntax check only (lint)
  -m               Show compiled in modules
  -r         Run PHP  without using script tags 
  -B   Run PHP  before processing input lines
  -R         Run PHP  for every input line
  -F         Parse and execute  for every input line
  -E     Run PHP  after processing all input lines
  -H               Hide any passed arguments from external tools.
  -s               Output HTML syntax highlighted source.
  -v               Version number
  -w               Output source with stripped comments and whitespace.
  -z         Load Zend extension .

  args...          Arguments passed to script. Use -- args when first argument
                   starts with - or script is read from stdin

  --ini            Show configuration file names

  --rf       Show information about function .
  --rc       Show information about class .
  --re       Show information about extension .
  --ri       Show configuration for extension .

Looks like -d with do it. So I ran the following:

php -d memory_limit=512M myScript.php

It worked fine.

If you can afford to change your php.ini file, use - -ini to see where your php.ini file is, then make your changes accordingly. You can also use -n to ignore your php.ini file, but then you will be using default parameters which may be even harder to debug.

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