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@NogDogMay 04.2010 — #I would say it's about 99% likely that even if you do trim(file_get_contents($file)) that the entire file contents is in memory as a PHP string, at least until after the trim() completes and returns its value. So for at least a moment the entire file size would be in memory. If this is an issue, you may be better of using fopen() - fgets() - fclose(), dealing with the file line by line instead of one big chunk, if that is logically possible with what you need to do and assuming it's a text file which has line breaks.
PHP Function Memory Considerations
I’m processing large files via PHP and I have some concerns regarding optimization of memory usage in the script.
For example, if I trim() a 300 MB file does PHP know to stream it internally, or does it actually load the whole thing into memory to process it?
Is any optimization achieved by doing:
$data = file_get_contents(<300 MB file>);
$trimmed = trim($data);
Versus:
$trimmed = trim(file_get_contents(<300 MB file>));
I have similar concerns for mdecrypt_generic() and other functions that could potentially process large amount of data, but don’t seem to have an explicit way to stream.
Please enlighten me, and thanks in advance.
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@NogDogMay 04.2010 — #