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run code in 300+ PHP versions simultaneously

@ 2014-11-06T16:03:20Z

<?php

const ERRMODE_EMPTY = 1;
const ERRMODE_LITERAL = 2;
const ERRMODE_EXCEPTION = 3;

function render_template($template, array $variables, $escapeChar = '@', $errMode = ERRMODE_EXCEPTION) {
    $esc = preg_quote($escapeChar);
    $expr = "/
        $esc$esc(?=$esc*+{)
      | $esc{
      | {(\w+)}
    /x";

    $callback = function($match) use($variables, $escapeChar, $errMode) {
        switch ($match[0]) {
            case $escapeChar . $escapeChar:
                return $escapeChar;

            case $escapeChar . '{':
                return '{';

            default:
                if (array_key_exists($match[1], $variables)) {
                    return $variables[$match[1]];
                } else if ($errMode === ERRMODE_EMPTY) {
                    return '';
                } else if ($errMode === ERRMODE_LITERAL) {
                    return $match[0];
                } else if ($errMode === ERRMODE_EXCEPTION) {
                    throw new \Exception('Unknown placeholder: ' . $match[1]);
                } else {
                    return $errMode;
                }
        }
    };

    return preg_replace_callback($expr, $callback, $template);
}

$template = <<<'TPL'
HELLO {name}
How are you doing {when}
Feeling @{ok}?
TPL;

$data = [
    'name' => 'WORLD',
    'when' => 'yesterday',
];

echo render_template($template, $data);

Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: HELLO WORLD How are you doing yesterday Feeling {ok}?
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/5i1fR on line 47
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_CONST in /in/5i1fR on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_CONST in /in/5i1fR on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/5i1fR on line 3
Process exited with code 255.

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