Get a PHP fully qualified class name from a file

Unfortunately, there is no ReflectionFile class, so you either have to assume the class name is the same as the file name, or you can tokenize the file & parse it for the class name.

You may also want to get traits. You can do that by modifying the if ($tokens[$i][0] === T_CLASS) line to use $tokens[$i][0] === T_CLASS || $tokens[$i][0] === T_TRAIT. I think the same works for T_INTERFACE, but I haven't confirmed.

Then you simply call $fullyQualifiedClassName = getClassFromFile($theFilePath);

function getClassFromFile($file){  
        $fp = fopen($file, 'r');  
        $class = $namespace = $buffer = '';  
        $i = 0;  
        while (!$class) {  
            if (feof($fp)) break;  
  
            $buffer .= fread($fp, 512);  
            ob_start();  
            $tokens = token_get_all($buffer);  
            $err = ob_get_clean();  
            // if (true&&strlen($err)>0){  
                // echo $buffer;  
                // echo $err."\n";  
                // echo $class."\n";  
                // echo "\n".$file;  
                // print_r($tokens);  
            // }  
            if (strpos($buffer, '{') === false) continue;  
  
            for (;$i<count($tokens);$i++) {  
                if ($tokens[$i][0] === T_NAMESPACE) {  
                    for ($j=$i+1;$j<count($tokens); $j++) {  
                        if ($tokens[$j][0] === T_STRING) {  
                            $namespace .= '\\'.$tokens[$j][1];  
                        } else if ($tokens[$j] === '{' || $tokens[$j] === ';') {  
                            break;  
                        }  
                    }  
                }  
  
                if ($tokens[$i][0] === T_CLASS) {  
                    for ($j=$i+1;$j<count($tokens);$j++) {  
                        if ($tokens[$j] === '{') {  
                            $class = $tokens[$i+2][1];  
                        }  
                    }  
                }  
            }  
        }  
        if ($class=='')return '';  
        return $namespace.'\\'.$class;  
          
    }