exec函数不返回所有行

Question

My awk command works as expected and returns 2 lines at command prompt.

When I use php "exec" function, it returns only the second line.

echo exec("awk -v RS=\",\" '/some_text/' test1.html");

How do I return all output of shell command using PHP?

Answer 1

If the output argument is present, then the specified array will be filled with every line of output from the command. Trailing whitespace, such as , is not included in this array. Note that if the array already contains some elements, exec() will append to the end of the array. If you do not want the function to append elements, call unset() on the array before passing it to exec().

http://php.net/manual/en/function.exec.php

$out = array();
exec("awk -v RS=\",\" '/some_text/' test1.html", $out);
foreach($out as $line) {
    echo $line;
}