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:
<?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 ?>
The running results are as follows:
Welcome to www.jb51.net! ome to www.jb5 net! Welcome to www.jb51.
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.