Two methods for php to remove the last two characters of a string: 1. Use the substr() function to intercept all characters except the last two characters from the head of the string. Just change the second character of the function. Set the first parameter to 0, and set the third parameter to "-2", the syntax is "substr(string,0,-2)". 2. Use the substr_replace() function to replace the last two characters of the string with the empty character "''". The syntax is "substr_replace(string,"",-2,2)".
The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer
php remove strings Two methods for the last two characters
Method 1: Use the substr() function
The substr() function can be specified from the string Position to intercept a certain length of characters. This intercepted character can be called a "substring" or "substring"
You only need to use the substr() function to intercept the last two types from the head of the string. All characters of characters:
means setting the second parameter of the function to 0, and setting the third parameter to -2 will delete the last two characters.
<?php header("content-type:text/html;charset=utf-8"); $str = "Hello World!"; echo "原字符串:"; var_dump($str); $newstr=substr($str,0,-2); echo "去除后两个字符:"; var_dump($newstr); ?>
Method 2: Use the substr_replace() function
The substr_replace() function is used to specify Starting at position, replace part of the string with another string.
Just use the substr_replace() function to replace the last two characters of the string with null characters:
Set the replacement value (second parameter) to the null character '', set the starting position (the third parameter) to -2 to delete the last two characters.
<?php header("content-type:text/html;charset=utf-8"); $str = "Hello"; echo "原字符串:"; var_dump($str); $newstr=substr_replace($str,"",-2,2); echo "去除后两个字符:"; var_dump($newstr); ?>
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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)”。

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."%"”。

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。

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。

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。

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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