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PHP的函数前加上“@”的作用 - PHP - 清泛IT论坛，有思想、有深度
@是PHP提供的错误信息屏蔽的专用符号。
比如在一个函数前使用@
@mysql_query 不会出现Warning，
而原来mysql_query 在遇到错误时会在页面上访提示Warning。
php安装gd库扩展（无需源码安装） - 更多技术 - 清泛网 - 专注C/C++及内核技术
php安装gd库扩展（无需源码安装）php_gd_installgd是php图片处理库，网上各种源码安装，非常复杂，其实很简单，无需源码编译。apt install php-gd重启apache生效：systemctl restart apache2gd是php图片处理库，网上各种源码安装，非常复杂，其...
htaccess Access-Control-Allow-Origin
...
from my experience;
if it doesn't work from within php do this in .htaccess it worked for me
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin http://www.vknyvz.com
Header set Access-Control-Allow-Credentials true
</IfModule>
credential...
Understanding the Rails Authenticity Token
...rver checks token when form posted, rejects forms without proper token.
Example token: session identifier encrypted with server secret key.
Rails automatically generates such tokens: see the authenticity_token input field in every form.
...
Using parameters in batch files at Windows command line
...p to grab them, as defined here:
http://www.robvanderwoude.com/parameters.php
Notes about delimiters for batch parameters
Some characters in the command line parameters are ignored by batch files, depending on the DOS version, whether they are "escaped" or not, and often depending on their locati...
Java string to date conversion
...ble format patterns:
Letter Date or Time Component Presentation Examples
------ ---------------------- ------------------ -------------------------------------
G Era designator Text AD
y Year Year 1996; 96
Y Week...
Is there a way to get the XPath in Google Chrome?
...opied most of the Firebug command-line commands: getfirebug.com/wiki/index.php/Command_Line_API
– huyz
Sep 3 '11 at 8:35
102
...
How to convert std::string to lower case?
...n't recommend you use:
char asciitolower(char in) {
if (in <= 'Z' && in >= 'A')
return in - ('Z' - 'z');
return in;
}
std::transform(data.begin(), data.end(), data.begin(), asciitolower);
Be aware that tolower() can only do a per-single-byte-character substitution, ...
Converting integer to binary in python
......
>>> bin8 = lambda x : ''.join(reversed( [str((x >> i) & 1) for i in range(8)] ) )
>>> bin8(6)
'00000110'
>>> bin8(-3)
'11111101'
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How to get git diff with full context?
...$ cat ~/.gitconfig | fgrep df
df = "! [ \"$GIT_PREFIX\" != \"\" ] && cd \"$GIT_PREFIX\"; ~/bin/git_df.sh"
$
$ cat ~/bin/git_df.sh
#!/bin/bash
for FILE in $@; do
git diff -U$(wc -l "${FILE}" | cut -d ' ' -f 1) "${FILE}"
done
exit 0
...