Question

Is it possible to identify Linux 32 or 64 bit, using PHP?

phpinfo() 

returns

Linux infong 2.4 #1 SMP Mon Oct 10 09:34:36 UTC 2011 i686 GNU/Linux 

It’s shared hosting so I cant use command line.

Answer 1

Do a simple test:

var_dump(is_int( 9223372036854775807 ));

For 32-bit environment it will return false as this number is much bigger that maximum 32-bit integer. For 64-bit environment it will return true.

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Or use PHP_INT_MAX as mario suggested in comments.

echo (PHP_INT_MAX == 2147483647)?'32-bit':'64-bit';

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Or use PHP_INT_SIZE:

echo (PHP_INT_SIZE * 8) . '-bit';