How to print array contents into a log file in magento CE 1.7 without iterating through a loop?

3 Answers 3

Mage::log(print_r($arr, 1), null, 'logfile.log');

Adding a second parameter to print_r will return a string with printed variable.
based on the comments below I feel obligated to offer other options for logging an array.

Mage::log($arr, null, 'logfile.log');

or if you need a string prefix to the array

Mage::log('prefix'.Zend_Debug::dump($arr, null, false), null, 'logfile.log');

The second parameter of Zend_Debug::dump() is a label. If this is not null it will be added to before the array dump.
The third parameter of Zend_Debug::dump() means echo. If it's true then the dump result will be echoed, if it's false it will be returned as a string. In your case you need it to be false.

  • Thanks. It worked perfectly. I think you have missed the comma between the parameters of print_r function. Instead there was a full-stop.
    – Sukeshini
    Sep 29, 2013 at 10:33
  • @Su123 Yeah...I saw that . It's fixed now
    – Marius
    Sep 29, 2013 at 10:36
  • 6
    You shouldn't need the print_r here, Magento's logger will autoexpand arrays and objects Sep 29, 2013 at 21:09
  • If you insist on using print_r, a better choice might be to use Zend_Debug::dump($var).
    – pspahn
    Sep 30, 2013 at 0:10
  • @Alan Storm : Thanks. I tested your suggestion. It works perfectly.
    – Sukeshini
    Sep 30, 2013 at 12:53

Have you tried to do just:

Mage::log($array, null, 'logfile.log', true);

Mage log method should expand the array it self.

  • Thanks a lot. It worked. I don't know why it didn't work earlier when I check.
    – Sukeshini
    Sep 30, 2013 at 3:15

As Petar pointed out, it is expanded, so if it is an array or an object, there is no print_r needed. But if you mix it, like:

Mage::log('my string' . $array);

you get a problem, because phps array to string conversion means:

array(... whatever...) -> 'String'

And with an object, php tries to call the __toString method if this doesn't exist, an error is thrown (I think).

And for reference, Mage::log():

public static function log($message, $level = null, $file = '', $forceLog = false)
    // ...
    // initialize ... blah stuff...
    // check wether logging is on, developer mode or logging is forced

    try {
        // get the file, define the format... more stuff ... blah ...

        if (is_array($message) || is_object($message)) {
            $message = print_r($message, true);

        $loggers[$file]->log($message, $level);
    catch (Exception $e) {

Nothing tested :-)

  • You are correct. I tested the code. If we put like Mage::log('my string' . $array); this will print 'my stringArray'
    – Sukeshini
    Sep 30, 2013 at 3:22

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