Force freeing memory in PHP

problem ：

In a PHP program, I sequentially read a bunch of files (with file_get_contents ), gzdecode them, json_decode the result, analyze the contents, throw most of it away, and store about 1% in an array. stay PHP In the program , I read a pile of files in turn （ Use file_get_contents ）, gzdecode They do json_decode Proceed with the result json_decode , Analysis content , Throw away most of the content , Then, about 1% The contents of are stored in an array .

Unfortunately, with each iteration (I traverse over an array containing the filenames), there seems to be some memory lost (according to memory_get_peak_usage , about 2-10 MB each time). Unfortunately , Every iteration （ I iterate through the array containing file names ）, It seems that some memory will be lost （ according to memory_get_peak_usage , About every time 2-10 MB）.I have double- and triple-checked my code; I checked my code twice and three times ;I am not storing unneeded data in the loop (and the needed data hardly exceeds about 10MB overall), but I am frequently rewriting (actually, strings in an array). I don't store unnecessary data in the loop （ And the data required is almost no more than 10MB）, But I often rewrite （ It's actually a string in an array ）.Apparently, PHP does not free the memory correctly, thus using more and more RAM until it hits the limit. obviously ,PHP Memory is not released correctly , Therefore, more and more RAM, Until the limit is reached .

Is there any way to do a forced garbage collection? Is there any way to force garbage collection ？Or, at least, to find out where the memory is used? perhaps , At least , Find out where the memory is used ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/AKPq