Concept
How does PHP handle file input and output?
ComputerScienceOne / Opening Files
"Because of the history of PHP, file functions, just like string functions, were mostly influenced by the C standard library functions and have very similar naming and usage. Writing binary or plaintext data is determined by which functions you use. In general whether or not a file input/output stream is buffered or unbuffered is determined by the system configuration. There are some ways in which this can be changed, but we will not cover them in detail."
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