PHP中的执行命令返回错误代码127

Question

I am trying to execute cs2cs command for converting data format. But it always returns error code 127

Here is the code snippet:

$r = system('echo "830404.55 810145.46" | cs2cs +init=epsg:2326 +to +init=epsg:4326 -f %.10f', $result);
//$r = system('sh /var/www/html/et/test.sh', $result); // returns error code 127
echo $r.'<br>'; // print nothing
echo $result.'<br>'; // print 127

1. It is OK when I execute 'echo "830404.55 810145.46" | cs2cs +init=epsg:2326 +to +init=epsg:4326 -f %.10f' 'echo "830404.55 810145.46" | cs2cs +init=epsg:2326 +to +init=epsg:4326 -f %.10f' with command line in Linux system.
   

2. It is OK when I execute '/var/www/html/et/test.sh' with command line in Linux system.
   
   

Any idea of why it happens? I am not sure it is problem with PHP or cs2cs . I think it may caused by cs2cs cannot be executed by apache user account. If it is the case, how to solve it? Thanks.

Answer 1

如果我使用cs2cs的完整路径，它将起作用：

$r = system('echo "830404.55 810145.46" | /usr/bin/cs2cs +init=epsg:2326 +to +init=epsg:4326 -f %.10f', $result);