PHP：测试换行的行长度

Question

如何测试块是否超出图像大小并将该文本换行到下一行。不确定我的 if 语句是否正确地做到了这一点。

$text="Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem http://somelongurl.com/then-we-make-it-super-long-with-some-more/ Lorem Ipsum Lorem Ipsum Lorem Ipsum";

$string_chunks = explode(' ', $text);

foreach ($string_chunks as $chunk) {

    if($end_x + $chunk > $image_width){
        $start_x = 5;
        $start_y += 20;
    }

   $coords = imagettfbbox($fontsize, $angle, $font, $chunk);

   $end_x = $coords[0] + $coords[4] + 10;

   $color_to_draw = is_a_url($chunk) ? $linkcolor : $black; 

   imagettftext($im, $fontsize, $angle, $start_x, $start_y, $color_to_draw, $font, $chunk);

   $start_x += $end_x;
}

通过这段代码，我得到：

Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem 
http://somelongurl.com/then-we-make-it-super-long-with-some-more/
Lorem Ipsum Lorem Ipsum Lorem Ipsum

我想要发生的事情是这样的：

Lorem Ipsum Lorem Ipsum Lorem Ipsum 
Lorem http://somelongurl.com/then-we
-make-it-super-long-with-some-more/
Lorem Ipsum Lorem Ipsum Lorem Ipsum

Answer 1

使用 wordwrap 并将第四个参数 $cut 作为 true 传递给它，以强制 URL 被破坏。

实例。

Answer 2

我想我知道你想要实现什么。我没有测试下面的代码，所以它可能需要一些改进和重新设计/测试。但它应该给你一个很好的起点

<?php
$text = "Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem http://somelongurl.com/then-we-make-it-super-long-with-some-more/ Lorem Ipsum Lorem Ipsum Lorem Ipsum";
$string_chunks = explode(' ', $text);

foreach ($string_chunks as $chunk) {
    $_start_bit = false;
    // before anything else check if chunk is url
    $color_to_draw = is_a_url($chunk) ? $linkcolor : $black; 
    // check if chunk is to long
    if(strlen($chunk) > $image_width) {
        // if there is allredy a word in the current line
        // make the first bit $imagewidth - current line width
        if ($start_x > 5) {
            $_start_bit = substr($chunk, 0, ($image_width - $start_x));
            $chunk = str_replace($_start_bit, "", $chunk);
        }
        $_chunkbits = wordwrap($chunk, $image_width, "\n", true);
        $_chunkbits = explode("\n", $_chunkbits);
        if($_start_bit) {
            array_unshift($_chunkbits, $_start_bit);
        }
        // loop bits and draw them
        foreach ($_chunkbits as $bit) {
            if($end_x + $bit > $image_width){
                $start_x = 5;
                $start_y += 20;
            }
            $coords = imagettfbbox($fontsize, $angle, $font, $bit);
            $end_x = $coords[0] + $coords[4] + 10;
            imagettftext($im, $fontsize, $angle, $start_x, $start_y, $color_to_draw, $font, $bit);
            $start_x += $end_x;
        }
        unset($_chunkbits);
    } else {
        if($end_x + $chunk > $image_width){
            $start_x = 5;
            $start_y += 20;
        }
        $coords = imagettfbbox($fontsize, $angle, $font, $chunk);
        $end_x = $coords[0] + $coords[4] + 10;
        imagettftext($im, $fontsize, $angle, $start_x, $start_y, $color_to_draw, $font, $chunk);
        $start_x += $end_x;
    }
}

Answer 3

if($end_x + $chunk > $image_width){ 
    $start_x = 5; 
    $start_y += 20; 
} 

一个主要错误，$end_x + (strlen($chunk)*$charPXsize) > $图像宽度
另一个错误，如果一行比$image_width长会发生什么？它会在下一行打印出来，但无论如何都太长了。

Answer 4

我所做的是迭代字符串，每次检查边界框是否太宽。如果是这样，请插入一个新行并继续，直到读完所有文本。然后将其全部写为一个大字符串...

$chunks = explode(' ', $text);
$wrappedText = '';
foreach ($chunks as $chunk) {
    $coords = imagettfbbox($fontsize, $angle, $font, $wrappedText.' '.$chunk);
    $width = $coords[2] - $coords[0];
    if ($width > $myMaxWidth) {
        $wrappedText .= "\n" . $chunk;
    } else {
        $wrappedText .= ' ' . $chunk;
    }
}
imagettftext(
    $im, 
    $fontsize, 
    $angle, 
    $start_x, 
    $start_y, 
    $color_to_draw, 
    $font, 
    $wrappedText
);

现在，请注意，这不会以不同的方式为您的链接着色...但是，您始终可以在其中添加一种检测方法来确定链接将被写入的确切位置，然后覆盖如果有的话用你的颜色...