我正在尝试使用 GD+PHP 输出多行文本，但无法正常工作。我的php知识真的很基础。 这是代码，关于如何输出 2 或 3 行文本的任何想法？
$theText = (isset($_GET['caption']))? stripslashes($_GET['caption']) :'';
imagettftext($baseImage, $textSize, $textAngle, $textXposition, $textYposition, $textColor, $fontName, $theText);
【问题讨论】：
imagettftext($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, $theText);
您必须添加 x 像素才能将其向下移动到 X 位置。请记住，您的整个图像应该足够高和足够宽以适合文本。
【讨论】：
split；要了解“边界框”，请使用 imagettfbbox... 如果您已经阅读了我在回答中提供的链接，您会看到一些建议您如何操作的示例。
API 不支持。 这是“手动”执行的代码：
【讨论】：
您可以每行重复一个 imagettftext；只需将$theText 拆分为一个数组（分隔符是NewLine）并循环遍历数组中的每个元素，将$textYposition 增加行的高度（参见$textSize，但实际上使用@987654325 会更好@.Read the page in the PHP manual
【讨论】：
我有一个未知长度的字符串，但只能使用一定的宽度。所以我想出了这个。基本上它将句子拆分为字符。如果碰到空格，则检查是否可以将单词添加到前一行，如果不能，则开始新行。超长的词也有蹩脚的安全，只是被砍了，以免走出形象。
在我实际将文本打印到图像的阶段，我检查该行是否小于允许的最大字符数并添加前导 + 尾随空格，以模仿 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;
}
}
不要忘记在一行中添加最后一个单词。您还需要检查它是否应该在新行上。
向图像添加线条：
//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;
}
【讨论】：
我的两分钱... （由于需要多行文本，所以在循环中添加文本）
<?php
error_reporting(E_ALL);
error_reporting(-1);
ini_set('error_reporting', E_ALL);
/*
construction of the tcp scan
I would prefer building a C C.G.I.
but let's experiment with php
(apache user rights over nmap resources)
no php ressources on google website,
noor ajax call (worker) other then 'self'
so
I will use a php trick into the <img> html tag.
(<img src="mysite.com/gdtrick.php">)
I'm wondering if I can do the same with, let's say,
gdtrick.cgi... that would be so cool.
*/
// size of the image to create
$x = 300;
$y = 300;
$displacement_y = 24;
//debug
//$zetext = "test";
$image = imagecreate($x,$y);
$white = imagecolorallocate($image, 255,255,255);
$black = imagecolorallocate($image, 0,0,0);
$zeipaddr = "";
$zetext = "";
function getUserIP() {
$ipaddress = '';
if (isset($_SERVER['HTTP_CLIENT_IP']))
$ipaddress = $_SERVER['HTTP_CLIENT_IP'];
else if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
$ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
else if(isset($_SERVER['HTTP_X_FORWARDED']))
$ipaddress = $_SERVER['HTTP_X_FORWARDED'];
else if(isset($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']))
$ipaddress = $_SERVER['HTTP_X_CLUSTER_CLIENT_IP'];
else if(isset($_SERVER['HTTP_FORWARDED_FOR']))
$ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
else if(isset($_SERVER['HTTP_FORWARDED']))
$ipaddress = $_SERVER['HTTP_FORWARDED'];
else if(isset($_SERVER['REMOTE_ADDR']))
$ipaddress = $_SERVER['REMOTE_ADDR'];
else
$ipaddress = 'UNKNOWN';
return $ipaddress;
}
$zeipaddr = getUserIP();
//for debug
//echo "IP: " .$zeipaddr."<br>\n";
//$zeipaddr = "192.168.1.18";
$ports = array(21, 22, 23, 80, 8080, 8081, 8082, 5900, 5901, 5902, 3306, 6000, 6001, 6002, 6003);
//$ports = array(80);
$text1 = imagettftext($image, 12, 0, 12, $displacement_y, $black, "/usr/share/fonts/truetype/freefont/FreeSans.ttf", "PHP SCAN ON DEMAND");
$displacement_y += 12;
foreach ($ports as $port)
{
$connection = @fsockopen($zeipadrr, $port, $errno, $errstr, 1);
if (is_resource($connection))
{
$zetext = $zeipadrr . ':' . $port . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.' ;
$text1 = imagettftext($image, 10, 0, 6, $displacement_y, $black, "/usr/share/fonts/truetype/freefont/FreeSans.ttf", $zetext);
fclose($connection);
}
else
{
$zetext = $zeipaddr . ':' . $port . " not active." ;
$text1 = imagettftext($image, 10, 0, 6, $displacement_y, $black, "/usr/share/fonts/truetype/freefont/FreeSans.ttf", $zetext);
}
$displacement_y += 16;
}
$displacement_y += 12;
$text1 = imagettftext($image, 12, 0, 12, $displacement_y, $black, "/usr/share/fonts/truetype/freefont/FreeSans.ttf", "Port scanning done !!!");
header('Content-Type: image/jpeg');
imagejpeg($image);
?>
【讨论】：