In "PHP String Exercise 1: Generating Random Passwords from a Given String", we introduce how to generate random passwords from a specified string, which is also the first chapter in the series of playing with strings. One article, interested friends can read it. In this article, we continue the string series!
The theme of this article is to quickly extract the file name from the specified string. First of all, everyone must know that there are two situations for obtaining the file name. One is the file name with the file suffix, and the other is without the suffix. The file names, such as the file names index
and index.php
, are still obviously different.
So here are two ways to extract file names:
The first one:
Get the file name without suffix File name, directly enter the code:
<?php $path = 'www.example.com/public_html/index.php'; $file = basename($path, ".php"); echo $file."\n";
The output result is as shown below:
This method is the simplest, just use the basename() function directly You can return the file name part of the path. The syntax is "basename(path,suffix)", where the parameter suffix represents the file extension. If the file has this parameter, the extension will not be output. Obviously we set this parameter Yes is ".php".
Second type:
Extract the file name with the suffix name, the code is as follows:
<?php $path = 'www.example.com/public_html/index.php'; $file_name = substr(strrchr($path, "/"), 1); echo $file_name."\n"; // "index.php"
The result is:
In this method we mainly use two functions strrchr and substr.
The strrchr function is used to find the last occurrence of a string in another string and return all characters from that position to the end of the string.
The substr function is used to return a part of a string, the syntax is "substr(string,start,length)
".
For details about the substr function, I recommend you read "php substr function definition and usage summary"
Finally, I still recommend a classic course on our platform. "PHP String Processing (Jade Girl Heart Sutra Edition)", free ~ come and learn!
The above is the detailed content of PHP string exercise 2: quickly extract file names from strings. For more information, please follow other related articles on the PHP Chinese website!

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php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

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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判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

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。


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