PHP: Change a positive condition to negative.

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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LVL 11
level9wizardAsked:
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shobinsunConnect With a Mentor Commented:

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;
}
?>
0
 
Chris HarteThaumaturgeCommented:
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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