Analysis on usage of substr function string interception in PHP

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Release: 2016-07-29 09:07:21
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The example in this article describes the usage of substr function string interception in PHP. Share it with everyone for your reference, the details are as follows:

The substr function in PHP is defined as follows:

substr(string,start,length)

The parameter description is as follows:

string required. Specifies a part of the string to be returned.

start
Required. Specifies where in the string to begin.
Positive number - Starts at the specified position in the string
Negative number - Starts at the specified position from the end of the string
0 - Starts at the first character in the string

length

Optional. Specifies the length of the returned string. The default is until the end of the string.
Positive number - the length returned from the position of the start parameter
Negative number - the length returned from the end of the string

The sample code is as follows:

<&#63;php
 echo substr("Welcome to www.jb51.net!",0); //原样输出,不截取
 echo "<br>";
 echo substr("Welcome to www.jb51.net!",4,14); //从第4个字符开始连续截取14个字符
 echo "<br>";
 echo substr("Welcome to www.jb51.net!",-4,4); //从倒数第4个开始截取4个字符
 echo "<br>";
 echo substr("Welcome to www.jb51.net!",0,-4); //从第一个字符开始截取,截取到倒数第4个字符
?>

Copy after login

The running results are as follows:

Welcome to www.jb51.net!
ome to www.jb5
net!
Welcome to www.jb51.

Copy after login

I hope this article will be helpful to everyone PHP programming helps.

The above has introduced the analysis of the usage of substr function string interception in PHP, including various aspects. I hope it will be helpful to friends who are interested in PHP tutorials.

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