3 methods: 1. Use the "str_replace("_",",",$str)" statement to find the underscore and replace it with a comma; 2. Use "str_ireplace("_"," ,",$str)" statement; 3. Use "preg_filter("/_/",",",$str)".
The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
php Convert the underscore to a comma Method: Find the underscore in the string and replace it with a comma.
You can use the following 3 methods to implement search and replacement:
Method 1: Use str_replace() function
<?php $str = '1_2_3_44678_5_'; echo str_replace("_",",",$str); ?>
Method 2: Use str_ireplace() function
<?php $str = '1_2_3_44678_5_'; echo $str."<br>"; echo str_ireplace("_",",",$str); ?>
Description: str_ireplace() and str_replace have similar syntax, and both Use a new string to replace a specific string specified in the original string; but str_replace is case-sensitive, str_ireplace() is not case-sensitive
Method 3: Use preg_replace()
The preg_replace() function can be used with regular expressions to find all underscores and replace them with commas.
<?php $str = '3_44678_5_'; echo $str."<br>"; echo preg_filter("/_/", ",", $str); ?>
Recommended learning: "PHP Video Tutorial"
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两种去除方法:1、使用rtrim()函数,语法“rtrim(数值,"0")”,可去除数值后面连续的零。2、用substr_replace(),语法“substr_replace(数值,'', -位置值)”,可从指定位置开始将零替换为空字符。

方法:1、用str_replace(),语法“str_replace(" "," ",$str)”;2、用preg_replace()配合正则表达式,语法“preg_replace('/\s+/'," ",$str)”。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php将小数点转为百分比的方法:1、利用“*”运算符将小数乘以100,语法“小数 * 100”,可将小数转为百分值;2、使用字符串拼接符“.”将百分值和“%”符拼接在一起,形成百分比字符串即可,语法“百分值."%"”。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

转换方法:1、使用“array_merge_recursive(数组1,数组2,数组3...)”语句将多个数组合并为一个数组;2、使用json_encode()将合并后的数组转为json数据,语法“json_encode(合并后的数组)”。

在php中,可以利用str_replace()函数来去除字符串中的多个指定子字符串,只需要将该函数的第一个参数设为包含多个值的数组,第二个参数设为空字符即可;语法“str_replace(数组,'',$str)”,会将多个子串替换为空字符。


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