Description:
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This is not a "problem", but a general issue that can be found in many pages of php documentation. When an example is given, sometimes it only shows the function call and not the output. It can be said that many of these are self-explaining, and it wouldn't be wrong. But a completely fool-proof documentation, which can be helpful even for a tired developer in late hours should include outputs for all examples.

Here is only one sample for the issue, and during my experience with php I've seen many pages giving examples like this. 
http://www.php.net/manual/en/function.realpath.php  shows how to call realpath function """ $real_path = realpath("../../index.php"); """ Proper output may be given as 
""" //Assuming your php file resides in /var/www/mysite/dir1/dir2
     echo $real_path
     // outputs
     // /var/www/mysite/index.php