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PHP: Change a positive condition to negative.

Posted on 2009-04-07
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Medium Priority
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415 Views
Last Modified: 2012-05-06
How can I reverse this condition in my function so that I don't need an else?
<?php
 
chdir_safe('../something\file.txt');
 
function chdir_safe($dir)
{	
	
	if (substr($dir,0,1) == "/" || substr($dir,0,1) == "\\" || substr($dir,1,1) == ":" ){
		//url is absolute
	}
	else
	{
		echo "fix the url<br>";
	}
	
	echo $dir;
	exit;
}
?>

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Question by:level9wizard
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2 Comments
 
LVL 17

Expert Comment

by:Chris Harte
ID: 24087579
Use the logical 'not' prefix which is an exclamation mark "!"
<?php
 
chdir_safe('../something\file.txt');
 
function chdir_safe($dir)
{       
        
        if (!substr($dir, 0, 1) == "/" 
            || !substr($dir, 0, 1) == "\\" 
            || !substr($dir, 1, 1) == ":" )
        {
            echo "fix the url<br>";
        }
        
        echo $dir;
        exit;
}
?>

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0
 
LVL 14

Accepted Solution

by:
shobinsun earned 2000 total points
ID: 24088136

Hello,

Use this:


<?php
 
chdir_safe('../something\file.txt');
 
function chdir_safe($dir)
{      
       
        if (!(substr($dir,0,1) == "/" || substr($dir,0,1) == "\\" || substr($dir,1,1) == ":" )){
                     
                echo "fix the url<br>";
        }
       
        echo $dir;
        exit;
}
?>
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