exec - Execution of DalekJS with PHP does not work -

i use testing framework dalekjs test user interface. execute testing script mytest.js type shell:

cd /applications/xampp/xamppfiles/htdocs/tests dalek mytest.js 

and works fine. execute same script php. code:

<?php chdir('/applications/xampp/xamppfiles/htdocs/tests'); $command = 'dalek mytest.js'; exec($command, $return, $return_var); var_dump($return); var_dump($return_var); 

running php-script in browser, prints:

array(0) { } int(127)  

the dalekjs script generates screenshot when executing in shell running php not happen anything. have tried shell_exec(), system() , passthru() without success. have idea why php script not work?

calling dalek php works fine me. possible php process running different environment (containing path, amongst other things) user? maybe apache user or such?

<?php  // change current working directory of current php process, // subsequently change initial cwd of exec() $wheremytestsare = __dir__; chdir($wheremytestsare);   // locate dalek $dalek = exec('which dalek');  // abort if there no dalek, // may want check path or supply full path if (!$dalek) {   echo "could not find dalek executable, please check path";   $path = exec('echo $path');   echo '$path ', $path, "\n";   exit(1); }  // relative $wheremytestsare // exec() blocks until child process (dalek) exits exec('dalek mytest.js');