can I have multiline text with GD and PHP?

问题

I'm trying to output multiline text with GD+PHP but can't get it working. my php knowledge is really basic. here's the code, any idea on how to output 2 or 3 lines of text?

$theText = (isset($_GET['caption']))? stripslashes($_GET['caption']) :'';
imagettftext($baseImage, $textSize, $textAngle, $textXposition, $textYposition, $textColor, $fontName, $theText);

回答1:

imagettftext($baseImage, $textSize, $textAngle, $textXposition, $textYposition, $textColor, $fontName, $theText);
imagettftext($baseImage, $textSize, $textAngle, $textXposition+(25), $textYposition, $textColor, $fontName, $theText);
imagettftext($baseImage, $textSize, $textAngle, $textXposition+(50), $textYposition, $textColor, $fontName, $theText);

you have to add x pixel to move it downwards to the X position. keep in mind that your whole image should be high and wide enough to fit the text.

回答2:

It's not supported by API. Here is the code to do it "manually":

http://php.net/manual/en/function.imagettftext.php#75718

回答3:

You can repeat one imagettftext per line; just split $theText into an array (separator is the NewLine) and loop for each element in the array, incrementing $textYposition by the height of the line (see $textSize, but indeed you'll get it better using imageftbbox. Read the page in the PHP manual

回答4:

I had an unknown length of string, but only a certain width to work with. So I came up with this. Basically it splits the sentence in chars. If it bumps on a whitespace, it checks if the word can be added to the previous line, if not, it starts a new line. There is also a lame safety for extra long words, who are just being chopped of, so as not to go out of the image.

In the stage where I actually print the text to the image, I check if the line is smaller than the maximum allowed characters and add leading + trailing whitespaces, to mimic text-align: center.

#  Split up the lines
    $arrMessage = str_split(stripcslashes($strMessage));
    $arrTemp = array();
    $line = 0;
    $word = array();
    $arrTemp[$line] = array();

    foreach($arrMessage as $char){

        //if we hit a space, see if we should continue line, or make a new line
        if($char == " ")
        {
            //calculate numbers of chars currently on line + number of chars in word
            $numTotalChars = (int) count($word) + (int) count($arrTemp[$line]);

            //if total > 14 chars on a line, create new line
            if($numTotalChars > 14)
            {                   
                $line++;
                $arrTemp[$line] = array();

            }
            $word[] = $char;
            //push word-array onto line + empty word array
            $arrTemp[$line] = array_merge($arrTemp[$line], $word);
            $word = array();

        }
        else
        {
       //if word is too long for a line, split it 
            if( count($word) > 16)
            {
                $numTotalChars = (int) count($word) + (int) count($arrTemp[$line]);

                if($numTotalChars > 16)
                {                   
                    $line++;
                    $arrTemp[$line] = array();

                }

                $arrTemp[$line] = array_merge($arrTemp[$line], $word);
                $word = array();

            }

            $word[] = $char;

        }
    }

Don't forget to add the last word to a line as well. You also need to the the check to see if it should be on a new line or not.

Add lines to image:

//add some px to x and y for every new line
    $pos_x = $font->position[0];
    $pos_y = $font->position[1];

    $numLineHeight = 20;

    $addToX = 0;

    if($font->angle > 5)
    {
        $addToX = 2;
    }
    else if($font->angle < 0)
    {
        $addToX = -2;
    }

#   ADD MESSAGE
    foreach($arrTemp as $arrLine){

        //leading/trailing whitespace (==center text)
        $numCharsOnThisLine = count($arrLine);          
        $extraWhiteSpace = 14 - $numCharsOnThisLine;
        $frontBackSpace = floor($extraWhiteSpace / 2);

        for($i = 0; $i < $frontBackSpace; $i++){
            array_unshift($arrLine, " ");
            $arrLine[] = " ";
        }
    //make string from char array
        $strLine = implode("", $arrLine);

        imagettftext ($image, $font->size, $font->angle, $pos_x, $pos_y, $tlt, $font->family, $strLine);
        $pos_x = $pos_x + $addToX;
        $pos_y = $pos_y + $numLineHeight;
    }

来源：https://stackoverflow.com/questions/2951452/can-i-have-multiline-text-with-gd-and-php

标签

php

text

multiline