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@ 2014-11-06T16:02:16Z

<?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 ($errMode === ERRMODE_EMPTY) {
                    return '';
                } else if ($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 git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Exception: Unknown placeholder: name in /in/q5Ic8:29 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/q5Ic8(36): preg_replace_callback('/\n @@(?=...', Object(Closure), 'HELLO {name}\nHo...') #2 /in/q5Ic8(50): render_template('HELLO {name}\nHo...', Array) #3 {main} thrown in /in/q5Ic8 on line 29
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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