Compare Equality

Comparing equality between several variables.

Ref WebmasterWorld PHP forum: http://www.webmasterworld.com/php/3912364.htm

$lines = file('data.txt');
$max = count($lines)-1; 
for($i=$max; $i>$max-10; $i--) {
	echo $lines[$i].'<br>'; 
}

true
true

false

test1 - test0 - test0 - test4

Checking undefined variables

// NB: Will generate an E_NOTICE message
echo "[$notdefined]";

// NB: Will generate an E_NOTICE message
if (is_null($notdefined)) {
	echo 'SUCCESS';
} else {
	echo 'FAILED';
}

// NB: Will generate an E_NOTICE message
if (strlen($notdefined) > 0) {
	echo 'SUCCESS';
} else {
	echo 'FAILED';
}

// NB: Will generate an E_NOTICE message
if ($notdefined_A == $notdefined_B) {
	echo 'SUCCESS';
} else {
	echo 'FAILED';
}

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