Phpsubstr function string Interception usage analysis

PHP substr is a functional function that is developed based on the PHP language that can return a part of a string. This example describes the use of SUBSTR function string interception in PHP. Share to everyone for your reference, as follows:

The SUBSTR function in PHP is defined as follows:

SUBSTR (String,start,length)

The parameters are described as follows:

string is required. A string that specifies the part to return.

Start

Necessary. Specifies where to start the string.

Positive number-starts at the specified position in the string

Negative number-starts at the specified position starting at the end of the string

0-Starts at the first character in a string

Length

Optional. Specifies the length of the string to be returned. The default is until the end of the string.

Positive number-length returned from the position where the start parameter is located

Negative number-The length returned from the end of the string

The sample code is as follows:

123456789 <?php  Echo substr ("Welcome to www.php.cn!", 0);//output without intercepting  echo "<br>";  echo substr ("Welcome to www.php.cn!", 4,14); 14 Characters of  echo "<br>" starting from the 4th character;  echo substr ("Welcome to www.php.cn!", -4,4);//4-character  echo "<br>" starting from the bottom of the 4th.  echo substr ("Welcome to www.php.cn!", 0,-4); Intercept from the first character and intercept to the 4th character?>

The results of the operation are as follows:

? 1234 Welcome to Www.php.cn!welcome tophp.cn! Welcome to www.php.cn.

Although the article is very brief, but can teach you a knowledge point, I hope that this article on the PHP program to help you.

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