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<?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; // 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(); $c3 = new \Foo\Bar\BUZ(); $c4 = new \Foo\Bar\Buz(); var_dump( $c1 == $c2, $c3 == $c4 );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Class "Foo\Bar\BUZ" not found in /in/i3uIM:39 Stack trace: #0 {main} thrown in /in/i3uIM on line 39
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.8, 7.1.10 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Class 'Foo\Bar\BUZ' not found in /in/i3uIM:39 Stack trace: #0 {main} thrown in /in/i3uIM on line 39
Process exited with code 255.
Output for 7.1.9
Fatal error: Uncaught Error: Class 'Foo\Bar\Baz' not found in /in/i3uIM:37 Stack trace: #0 {main} thrown in /in/i3uIM on line 37
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.20, 5.4.22 - 5.4.45, 5.5.0 - 5.5.1, 5.5.3 - 5.5.34, 5.5.36 - 5.5.38, 5.6.0 - 5.6.18, 5.6.20, 5.6.22 - 5.6.40
Fatal error: Class 'Foo\Bar\BUZ' not found in /in/i3uIM on line 39
Process exited with code 255.
Output for 5.4.21, 5.5.35, 5.6.21
Fatal error: Class 'Foo\Bar\Baz' not found in /in/i3uIM on line 37
Process exited with code 255.
Output for 5.5.2, 5.6.19

Process exited with code 135.
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_FUNCTION, expecting ')' in /in/i3uIM on line 8
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_FUNCTION, expecting ')' in /in/i3uIM on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/i3uIM on line 8
Process exited with code 255.

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