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PHP符号
- WBOYOriginal
- 2016-06-23 14:36:15905browse
.= 把右边的字串加到左边
$ 变量符号
& 变量的指标(加在变量前)
@ 不显示错误信息(加在函数前)
-> 对象的方法或者属性
=> 数组的元素值
’ ’ 单引号,原样输出;
" "双引号,php动态处理然后输出,一般用于变量.
反单引号是执行一个命令，如`pwd`
PHP转换字符串为大小写
strtolower(); 把字符串转小写
strtoupper(); 把字符串转大写
PHP加密字符串
md5();加密
sha1();加密
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