Description:
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Using the dom function schemaValidate function occurs a the following error: Fatal error: Out of memory (allocated 8650752) (tried to allocate 63 bytes) in /home/arrowvoi/arrowvoice/html/xmlforms/tools.php on line 48

The line of the error is (if (!$dom->schemaValidate($schema)) ).

I already put the memory limit to 256MB using a local php.ini, the hosting has it at 32MB, but it didn't work.  I also tried with memory_limit -1.

I'm using php 5.2.3.  I have also the same function in my Windows Vista PC and it works propertly, but in the server it doesn't.

I would really appreciate any help cause I've been working with this for a long time and I haven't found a solution.

Reproduce code:
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		function validateXML($formName, $xmlUrl, $xmlBody, $schema){
			libxml_use_internal_errors(true);
			$dom = new DomDocument();
			$dom->load($xmlUrl); 
			if (!$dom->schemaValidate($schema)) {
				$valid = false;
				$errorMessage = $this->libxml_display_errors();  
				$validationMail = $this->createValidationMail($formName, $xmlBody, $errorMessage);
			} else {
			  $valid = true;
			  $validationMail = '';
			}
			return $validationMail;		  
		}	


Expected result:
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The function should finished successfully returning a validation String with the results.

Actual result:
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Fatal error: Out of memory (allocated 8650752) (tried to allocate 63 bytes) in /home/arrowvoi/arrowvoice/html/xmlforms/tools.php on line 48