Longest string challenge: Difference between revisions

=={{header|PHP}}==

<lang PHP><?php

echo 'Enter strings (empty string to finish) :', PHP_EOL;

$output = $previous = readline();

while ($current = readline()) {

$p = $previous;

$c = $current;

// Remove first character from strings until one of them is empty

while ($p and $c) {

$p = substr($p, 1);

$c = substr($c, 1);

}

// If $p and $c are empty : strings are of equal length

if (!$p and !$c) {

$output .= PHP_EOL . $current;

}

// If $c is not empty, $current is longer

if ($c) {

$output = $previous = $current;

}

}

echo 'Longest string(s) = ', PHP_EOL, $output, PHP_EOL;</lang>

{{out}}

<pre>Enter strings (empty string to finish) :

a

bb

ccc

ddd

ee

f

ggg

Longest string(s) =

ccc

ddd

ggg</pre>