Description:
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i've got file where is written e.g. 16 and filesize is 2 B
i gave readfile("x.txt") to variable, name is not important, and then when i called variable e.g. echo $read it showed me 162 . it means that it wrote the file and after it is written filesize. so i can't use readfile in variable

Reproduce code:
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$read = readfile("x.txt");
echo $read;

Expected result:
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x.txt = 16
filesize = 2

$read = readfile("x.txt");
echo $read;   /write 16

Actual result:
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x.txt = 16
filesize = 2

$read = readfile("x.txt");
echo $read;   /is writting 162