Prevent body overlapping footer in mPDF

$mpdf->setAutoBottomMargin = 'stretch';

Worked for me. All I had to do was to make sure I included the option before the footer.

The problem lies in the documentation of mpdf. I think margin_footer and margin_header is the margin between the document body and these. Instead, margin_footer and margin_header is the document margins, as one would think margin_top and margin_bottom would be.

So, changing the bottom and top margin will decide where the document body starts. And changing the header/footer margin will decide the printing margins.

Hope it helps!

Updated answer

mPDF documentation is a bit off for the constructor call, I guess. The margin_top/bottom argument is actually the content margin, and does not apply for margin_header/footer arguments. (If I recall correctly). The margin_top/bottom is the absolute margin from the top of the document, and should include the height of the header/footer.

Here is the correct way of handling the margins:

/**
 * Create a new PDF document
 *
 * @param string $mode
 * @param string $format
 * @param int $font_size
 * @param string $font
 * @param int $margin_left
 * @param int $margin_right
 * @param int $margin_top (Margin between content and header, not to be mixed with margin_header - which is document margin)
 * @param int $margin_bottom (Margin between content and footer, not to be mixed with margin_footer - which is document margin)
 * @param int $margin_header
 * @param int $margin_footer
 * @param string $orientation (P, L)
 */
new mPDF($mode, $format, $font_size, $font, $margin_left, $margin_right, $margin_top, $margin_bottom, $margin_header, $margin_footer, $orientation);