When logging with PHP, or when Ajax requests an error and wants debug. We usually write the information to a specified file In the middle. Then deal with the problem according to the corresponding information. For example, I like to add the following code to the PHP script when I can’t get data with Ajax

$fp = fopen('./a.txt', 'a+b');
fwrite($fp, $content);
fclose($fp);

But there is one problem. So what if $content is 1 array? You might say, I’m looping the output. What about multidimensional arrays? I’m just getting so tired for debug. Here you can use var_export(). This function returns structural information about the variable passed to the function, which is similar to var_dump() except that The returned representation is the valid PHP code. You can return a representation of a variable by setting the second argument of the function to TRUE.

$fp = fopen('./a.txt', 'a+b');
fwrite($fp, var_export($content, true));
fclose($fp);

Note that the second parameter of var_export() needs to be set to true to indicate a return value. Or direct output Also, if your $content is just an array and contains nothing else You can also use print_r() Similarly, the second parameter of print_r() is also set to true

$fp = fopen('./a.txt', 'a+b');
fwrite($fp, print_r($content, true));
fclose($fp);