PHP怎么办移动端提交的表情字符
PHP怎么处理移动端提交的表情字符？
现在移动端提供了很多表情，比如百度输入法中的表情。
很多表情在用php获取之后，属于无法识别的内容，在存入mysql的时候，会导致从表情位置开始，后面的内容都会丢失。
比如用户输入： 开始内容 [表情] 结束内容
用php获取，并存入mysql时，只能保存： 开始内容[
有什么办法能够把这些无法识别的表情删除，而不影响后面的内容呢？
比如上面的表情如果无法识别，那也希望能够存入mysql的是：开始内容[]结束内容
------解决思路----------------------
需设置 mysql 的字符集为 utf8mb4
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