获取函数被调用的行？ [重复]

Question

This question already has an answer here:

• function name($param, $line = __LINE__, $file = __FILE__) {}; 4 answers

I've looked this up and I know that the answer probably involves the use of debug_backtrace(), but I am struggling on how to use it or exactly what it does.

Basically, if this was index.php:

<?php
//some code
//some more code

require "functions.php";

print_line();

//some code

print_line();
?>

and functions.php was:

<?php
function print_line(){
    $line="[line that this function was called at]";
    print "This function was called from line $line of index.php<br />";
}
?>

What would be the correct way of setting $line so that the output would be:

This function was called from line 7 of index.php
This function was called from line 11 of index.php

</div>

Answer 1

You can use the code below to get the current line, just pass it in as a parameter to your print_line() function

print_line(__line__);