get specific value from file_get_content

[obselslop]

hi i need to get specific content from the file get content but the problem is if i made a function which determine the content of a page and when i call this function in a loop (means more than 200 times) than memory limit problem occur . i have resolve this problem by increase the memory limit by ini_set . My Question is that how can i increase the performance of this function.should i use ob_flush after reading the content or there is another way .please let me know .thnks