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Drupal 6.x - PHP Memory Limit

When using image processing like image field and image cache you may need to increase your PHP memory limit in these two places:

1) .htaccess (in your root directory - where drupal is installed)

add to this section:

# PHP 5, Apache 1 and 2.
<IfModule mod_php5.c>

Just above </IfModule>

The following code:

  php_value post_max_size                   24M
  php_value upload_max_filesize             24M
  php_value memory_limit                    96M

2) settings.php (in your sites/default/ directory)

Under the section:
/**
* PHP settings:

Add the following code:

ini_set('memory_limit', '96M');