问题
Why am I getting the error PHP Fatal error: Call to undefined function imagettftext()
on line 29?
<?php
ob_start();
session_start();
$strings = '123456789';
$i = 0;
$characters = 6;
$code = '';
while ($i < $characters)
{
$code .= substr($strings, mt_rand(0, strlen($strings)-1), 1);
$i++;
}
$_SESSION['captcha'] = $code;
//generate image
$im = imagecreatetruecolor(124, 40);
$foreground = imagecolorallocate($im, 0, 0, 0);
$shadow = imagecolorallocate($im, 173, 172, 168);
$background = imagecolorallocate($im, 255, 255, 255);
imagefilledrectangle($im, 0, 0, 200, 200, $background);
// use your own font!
$font = 'monofont.ttf';
//draw text:
imagettftext($im, 35, 0, 9, 28, $shadow, $font, $code);
imagettftext($im, 35, 0, 2, 32, $foreground, $font, $code);
// prevent client side caching
header("Expires: Wed, 1 Jan 1997 00:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
//send image to browser
header ("Content-type: image/png");
imagepng($im);
imagedestroy($im);
?>`
My PHP Info:
![](https://i0.wp.com/i.stack.imgur.com/DCpWW.png)
![](https://i0.wp.com/i.stack.imgur.com/0Guvk.png)
回答1:
According to the PHP manual entry for imagettftext():
This function requires both the GD library and the » FreeType library.
You must be missing one or both of the required libraries in your PHP build.
回答2:
I solve the same issue on my docker php:7-fpm
enviroment, and I post the solution here:
If using Dockerfile
to setup the enviroment
# more Dockerfile
FROM php:fpm
RUN apt-get update && apt-get install -y \
libfreetype6-dev \
libmcrypt-dev \
libpng12-dev \
libjpeg-dev \
libpng-dev
&& docker-php-ext-install iconv mcrypt \
&& docker-php-ext-configure gd \
--enable-gd-native-ttf \
--with-freetype-dir=/usr/include/freetype2 \
--with-png-dir=/usr/include \
--with-jpeg-dir=/usr/include \
&& docker-php-ext-install gd \
&& docker-php-ext-install mbstring \
&& docker-php-ext-enable gd
If want to add the FreeType module on an exist container:
# on docker host machine
docker exec -it $FPM_CONTAINER bash
>>>>
# inside the container
apt-get install -y \
libfreetype6-dev \
libmcrypt-dev \
libpng12-dev \
libjpeg-dev \
libpng-dev
docker-php-ext-configure gd \
--enable-gd-native-ttf \
--with-freetype-dir=/usr/include/freetype2 \
--with-png-dir=/usr/include \
--with-jpeg-dir=/usr/include \
&& docker-php-ext-install gd
exit
<<<<
docker restart $FPM_CONTAINER
回答3:
Just recompile extension gd.so, under folder php/ext/gd
./configure --with-php-config=/usr/local/php5/bin/php-config --with-freetype-dir=/usr/ --enable-gd-native-ttf
回答4:
For a Docker container with an Apache 7.3 , the following is working for me:
FROM php:7.3.10-apache
RUN apt-get install -y libpng-dev libjpeg-dev libfreetype6-dev \
&& docker-php-ext-configure gd \
--with-freetype-dir=/usr/include/freetype2 \
--with-png-dir=/usr/include \
--with-jpeg-dir=/usr/include \
&& docker-php-ext-install gd
It's basically a cleaned up version as provided by Alfred Huang - without mcrypt
and mbstring
.
来源:https://stackoverflow.com/questions/7290958/php-fatal-error-call-to-undefined-function-imagettftext