How to implement character replacement in php

php implementation method of replacing characters

php replaces characters in a string. There are usually two functions that can Use, str_replace() and strtr()

str_replace() functionDefinition and usage

str_replace() function replaces a string with other characters some characters in (case sensitive).

该函数必须遵循下列规则：
如果搜索的字符串是数组，那么它将返回数组。
如果搜索的字符串是数组，那么它将对数组中的每个元素进行查找和替换。
如果同时需要对数组进行查找和替换，并且需要执行替换的元素少于查找到的元素的数量，那么多余元素将用空字符串进行替换
如果查找的是数组，而替换的是字符串，那么替代字符串将对所有查找到的值起作用。

Note: This function is case-sensitive. Please use the str_ireplace() function to perform a case-insensitive search.

Note: This function is binary safe.

Syntax

str_replace(find,replace,string,count)

Parameters

find必需。规定要查找的值。
replace必需。规定替换 find 中的值的值。
string必需。规定被搜索的字符串。
count可选。对替换数进行计数的变量。

strtr() function definition and usage

strtr() function converts specific strings character of.

Note: If the lengths of the from and to parameters are different, they will be formatted to the shortest length.

Grammar

strtr(string,from,to)

Or:

strtr(string,array)

Parameters

string必需。规定要转换的字符串。
from必需（除非使用数组）。规定要改变的字符。
to必需（除非使用数组）。规定要改变为的字符。
array必需（除非使用 from 和 to）。数组，其中的键名是更改的原始字符，键值是更改的目标字符。

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