Multi-line imagefttext method

multilineImageFTText.php

<?php
    public function multilineImageFTText($canvas, $fontSize, $font, $color, $copy, $start_x, $start_y, $width, $alignment) 
    { 
        // Holds lines
        $strings = array(); 

        // Placeholder for first element
        $strings[] = ''; 

        // Split copy into array using space
        $words = explode(' ', $copy);

        // Get font height
        $tb = imageTTFBbox($fontSize, 0, $font, 'foobar');
        $fontHeight = abs($tb[1] + $tb[5]);
        $start_y = $start_y + $fontHeight;

        // Loop over words
        foreach ($words as $key => $word) {
            
            // Set array pointer to the end of the array and add a space to the end.
            $str = end($strings).' ';
            
            // Create a temp string to test 
            $tmpString = trim($str.$word);

            // Calulate width of temp string
            $tb = imageTTFBbox($fontSize, 0, $font, $tmpString);
            $tmpWidth = abs($tb[0] + $tb[2]);
            
            // Check if the temp string width exceed allocated width
            if($tmpWidth <= $width){
                // Append to string in last array element
                $strings[key($strings)] = $tmpString;
            } else {
                // Create a new string element and add current word
                $strings[] = $word;
            }

        }

        // Loop over strings
        foreach ($strings as $key => $string) {

            // Get string width
            $tb = imageTTFBbox($fontSize, 0, $font, $string);
            $tmpWidth = abs($tb[0] + $tb[2]);

            switch ($alignment) {
                case 'center':
                    $offsetLeft = ($width - $tmpWidth) / 2;
                    break;

                case 'right':
                    $offsetLeft = ($width - $tmpWidth);
                    break;
                
                default:
                    $offsetLeft = 0;
                    break;
            }

            // Add string to canvas
            imagefttext($canvas, $fontSize, 0, $start_x + $offsetLeft, $start_y, $color, $font, $string); 

            // Increment line height
            $start_y = $start_y + $fontHeight;
        }

        return $canvas;
    }