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Fatal Error: Allowed Memory Size of 134217728 Bytes Exhausted (CodeIgniter + XML-RPC) is generated when all allowed memory consumed and no memory is available to process to request. To resolve this issue either increase memory limit in your code  as below in your index.php file in root. ini_set('memory_limit', ...

When you are working with large loop, Image Processing or PDF creation in PHP. That need lots of memory at runtime and you can get the error. Allowed memory size of 134217728 bytes exhausted (tried to allocate 282624 bytes) This error occur because your Default php.ini memory_limit is 128 ...