php calculate file size after reading the content

Question

Using php i have contents of a file through file_get_contents() function. I want to calculate the size of the file using the contents. Is there a precise way to do it ?

I tried strlen(contents) , suggested in one of the answers , but there is quite difference in size returned and actual file size on computer.

Note : using ubuntu 12.04

EDIT : sorry for the waste of time guys, it seems the contents were base64_encode() which led to mismatch in sizes. I appreciate your time and effort. Sorry again.

There shouldn't be a difference in size? strlen produces the amount of characters (bytes) in the contents. Multiply that by 1024 to get the correct amount of kb. And so forth. From PHP.net: strlen() returns the number of bytes rather than the number of characters in a string. — Ryan
– Ryan, Commented Dec 16, 2013 at 11:13
Are you trying to calculate the size of the file or the amount of characters in the file? — The Humble Rat
– The Humble Rat, Commented Dec 16, 2013 at 11:14
Can you give a concrete example of such a "quite difference"? — deceze
– deceze ♦, Commented Dec 16, 2013 at 11:18
@deceze , file size on my system 1536420 bytes , size returned by strlen 2048560 — minas
– minas, Commented Dec 16, 2013 at 12:07

웃웃웃웃웃 · Accepted Answer · 2013-12-16 11:16:07Z

1

Check filesize() for that and try like this


$filename = 'somefile.txt';
echo $filename . ': ' . filesize($filename) . ' bytes';

answered Dec 16, 2013 at 11:16

웃웃웃웃웃

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1 Comment

minas Over a year ago

I dont have the file location , only contents :(

voondo · Accepted Answer · 2013-12-16 11:15:45Z

5

if strlen() doesn't return the length in bytes, check that 'function overloading' of mbstring is not enabled : http://www.php.net/manual/en/mbstring.overload.php

answered Dec 16, 2013 at 11:15

voondo

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1 Comment

minas Over a year ago

function overloading of mbstring is not enabled and strlen() does return the size in bytes

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