Re: explanation of sentence

On November 19, 2001 07:26 am, Simone Cortesi wrote: > Hi, > > I vas translating the following : > > <!ENTITY return.falseproblem '<warning><simpara>This function may > return &false;, but may also return a value evaluating to &false; in > a simple if statement. Please use <link > linkend="language.operators.comparison">the === operator</link> for > testing the return value of this > function.</simpara></warning>'> > > found in 'language-snippets.ent', but i cant get the meaning of this > sentence: "but may also return a value evaluating to &false; in a > simple if statement". The sentence is attempting to explain that some functions may return values that can be interpreted as false within a conditional block. Take the following example: $str = 'abcdef'; $chr = 'a'; if ($pos = strpos ($str, $chr) ) echo "'$chr' found in '$str' at position $pos"; 'a' definitely exists in the string. However, since strpos() returns 0 - the position that 'a' is at - the if statement considers the result to be false. For cases like this, the user needs to use code more like: $str = 'abcdef'; $chr = 'a'; if (FALSE !== ($pos = strpos ($str, $chr)) ) echo "'$chr' found in '$str' at position $pos"; FTM, they could also do: $str = 'abcdef'; $chr = 'a'; $pso = strpos ($str, $chr); if ( is_int ($pos) ) echo "'$chr' found in '$str'"; -- Zak Greant PHP Quality Assurance Team http://qa.php.net/ "We must be the change we wish to see." - M. K. Ghandi