25 lines
620 B
PHP
25 lines
620 B
PHP
<?php
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echo 'Enter strings (empty string to finish) :', PHP_EOL;
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$output = $previous = readline();
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while ($current = readline()) {
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$p = $previous;
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$c = $current;
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// Remove first character from strings until one of them is empty
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while ($p and $c) {
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$p = substr($p, 1);
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$c = substr($c, 1);
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}
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// If $p and $c are empty : strings are of equal length
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if (!$p and !$c) {
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$output .= PHP_EOL . $current;
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}
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// If $c is not empty, $current is longer
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if ($c) {
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$output = $previous = $current;
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}
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}
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echo 'Longest string(s) = ', PHP_EOL, $output, PHP_EOL;
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