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Change memory_limit via ini_set() in a PHP Script (Sibling Reference)
2 min read
21.09.2025
If you want to remove the memory limit only for a specific PHP script, you can use the ini_set() function instead of modifying the global php.ini file.
For the primary article and related guides, see Change memory_limit via ini_set() — primary article, php.ini Set memory_limit = -1, and CLI memory_limit = -1.
Example: Set memory_limit = -1 in a PHP Script
Add this line at the beginning of your PHP script:
<?php
ini_set('memory_limit', '-1');
// Example: Process large data
$data = str_repeat("A", 1024 * 1024 * 100); // 100MB of data
echo "Memory Limit Set to: " . ini_get('memory_limit');
?>What This Does:
ini_set('memory_limit', '-1');removes all memory limits for this script only.ini_get('memory_limit');confirms that the limit has changed.
Verify the Change
Run the script and check the output. It should display:
Memory Limit Set to: -1Alternatively, use:
<?php
echo "Current memory limit: " . ini_get('memory_limit');
?>When to Use ini_set('memory_limit', '-1')
- Best for temporary needs (large file processing, database queries, backups).
- Good for CLI scripts where you have control over execution.
- Not recommended in production unless necessary (it may cause excessive memory use).
- Does not work if memory_limit is set in php.ini with PHP_INI_SYSTEM (some shared hosts enforce limits).
Alternative: Set a High Memory Limit Instead
Instead of removing the limit, set a higher value:
ini_set('memory_limit', '512M'); // 512MB
ini_set('memory_limit', '2G'); // 2GBUse in CLI Mode (Command Line Execution)
If you are running a PHP script via the command line, you can pass the memory limit directly:
php -d memory_limit=-1 script.php- Use
ini_set('memory_limit', '-1');inside PHP scripts to allow unlimited memory for that script only. - It is safer than modifying php.ini globally.
- Monitor memory usage to avoid crashes.
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