mac 上 php 验证码不显示图片

20190718 学习做一个 thinkphp5 的验证码，结果发现在我的 macbook 上死活不出图片，但是在windows 上是可以的！断定问题出在环境上！

macOS Mojave 10.14.5 
WEB： 自带的 apache
PHP：自带的 php 7.1

经过了一大圈重装 apache 和 php 之后，终于是出来了！

1、现状

2、之前是这样的

3、记录一下分析和解决的过程

重装 apache 和 php 的过程分别记录在了
MacBook 重装 Apache 和 PHP 7.2
https://blog.csdn.net/u010953609/article/details/96474165
Mac 重装 Apache 后中文目录乱码
https://blog.csdn.net/u010953609/article/details/96479940
macbook 系统 php 版本和 web 的 php 版本不一样，brew link php 失败
https://blog.csdn.net/u010953609/article/details/96480355

以上 3 个实际上和 php 代码没有什么关系！

$ brew info gd

 gd: stable 2.2.5 (bottled), HEAD
 Graphics library to dynamically manipulate images
 https://libgd.github.io/
 Not installed
 From: https://mirrors.ustc.edu.cn/homebrew-core.git/Formula/gd.rb
 ==> Dependencies
 Required: fontconfig ✘, freetype ✘, jpeg ✘, libpng ✔, libtiff ✘, webp ✘
 ==> Options
 --HEAD
 	Install HEAD version

把以上打X 的一个一个安装上！

brew install fontconfig
brew install freetype
brew install jpeg
brew install libtiff
brew install webp

一个一个确认一下

brew info freetype
brew info jpeg
brew info libpng
brew info zlib

	zlib: stable 1.2.11 (bottled) [keg-only]
	General-purpose lossless data-compression library
	https://zlib.net/
	Not installed
	From: https://mirrors.ustc.edu.cn/homebrew-core.git/Formula/zlib.rb
	==> Caveats
	This formula is keg-only, which means it was not symlinked into /usr/local,
	because macOS already provides this software and installing another version in
	parallel can cause all kinds of trouble.

再次安装
brew install zlib

发现问题出在 freetype
brew install freetype
Updating Homebrew…
Warning: freetype 2.9.1 is already installed, it’s just not linked
You can use brew link freetype to link this version.

brew link freetype

 Linking /usr/local/Cellar/freetype/2.9.1... 
 Error: Could not symlink share/aclocal/freetype2.m4
 /usr/local/share/aclocal is not writable.

再来
$ sudo chmod -R 777 aclocal
$ brew link freetype
Linking /usr/local/Cellar/freetype/2.9.1… 8 symlinks created
$ sudo apachectl restart
正以为一切 ok 的时候，却绝望的发现一切依然！