php use the exec() return 127

Question

I would like to execute a statement on my website, the server environment is LNMP, the single always return 127, can not be executed.

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$dir = 'php /alidata/www/index.php gitblog exportsite';
exec("$dir",$output,$is_success);
print_r($output);
echo"<br>";
echo $is_success;
echo"<br>";

Answer 1

Error code 127 is returned for an illegal command. Try

$output=array(); // $output should be an array
$dir = '/alidata/www/index.php gitblog exportsite';
exec("$(which php) $dir",$output,$is_success);