Description:
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For my purpose I'am parsing into array of strings, 5mb file with near 30000 lines. 

file ? Reads entire file into an array

It exhaust memory while doing. Code like:

file("here_goes_5mb_30k_lines_file.cvs");

with 8mb opened for executing will produce:
Fatal error: Allowed memory size of 8388608 bytes exhausted

Reproduce code:
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file("here_goes_5mb_30k_lines_file.cvs");

Actual result:
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Fatal error: Allowed memory size of 8388608 bytes exhausted