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run code in 300+ PHP versions simultaneously
<?php $base_dir = sys_get_temp_dir() . DIRECTORY_SEPARATOR; file_put_contents($base_dir . 'Baz.php', "<?php namespace Foo\Bar; class Baz {}"); file_put_contents($base_dir . 'Buz.php', "<?php namespace Foo\Bar; class Buz {}"); spl_autoload_register(function ($class) { // project-specific namespace prefix $prefix = 'Foo\\Bar\\'; // base directory for the namespace prefix global $base_dir; # = __DIR__ . '/src/'; // does the class use the namespace prefix? $len = strlen($prefix); if (strncmp($prefix, $class, $len) !== 0) { // no, move to the next registered autoloader return; } // get the relative class name $relative_class = substr($class, $len); // replace the namespace prefix with the base directory, replace namespace // separators with directory separators in the relative class name, append // with .php $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php'; // if the file exists, require it if (file_exists($file)) { require $file; } }); $c1 = new \Foo\Bar\Baz(); $c2 = new \Foo\Bar\BAZ(); var_dump(php_uname('s'), $c1 == $c2); $c3 = new \Foo\Bar\BUZ(); $c4 = new \Foo\Bar\Buz(); var_dump(php_uname('s'), $c3 == $c4);

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