<?php
    require_once 'a.php';
?>

<?php
    echo 'Hello World';
?>

<!-- 1. Please speak English, this is the language all of us can speak and write. 2. Please take a moment to check that your issue doesn't already exist. 3. Please give all relevant information below for bug reports, because incomplete details will be handled as an invalid report. --> # Aer Information - Aer Version (or commit ref): 4c81475afb - Operating System: Linux - System Architecture (eg. arm, x86_64, ...): x86_64 # Your problem description When relative path is passed as argument to include alike function, it looks for source file in current directory (.). When first source file is opened, it should change working directory to it. This way, script will behave in the same way, independent on CWD. Example directory structure: ~/ ~/binary ~/binary/psharp ~/test.php ~/a.php test.php: <?php require_once 'a.php'; ?> a.php: <?php echo 'Hello World'; ?> If our current working directory (CWD) is ~/binary and we call ./psharp ../test.php it will not find a.php. However, if we change directory to ~ and call ./binary/psharp test.php it will work just fine.