Introduction to how PHP intercepts strings

A very important technique in PHP is to intercept characters of a specified length in a specified string. PHP can use the PHP pre-defined function substr () function to intercept the string to realize, believe that everyone is very clear, then I have those methods!

The code is as follows:

Strpos (String,find,start)

Instance:

The code is as follows:

<?php  Echo strpos ("Hello world!", "Wo");  ? >

Output 6

The code is as follows:

SUBSTR (String,start,length)

Where start is the parameter

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 a string

The code is as follows:

<?php  Echo substr ("Hello world!", 6,5);  ? >

Output World

The Strstr () function searches for the first occurrence of a string in another string.

The function returns the remainder of the string (from the matching point). returns false if the searched string is not found.

The code is as follows:

Strstr (' abc@jb51.net ', ' @ ', TRUE); The parameter sets true to return the header before the lookup value @ abcstrstr (' abc@jb51.net ', ' @ '); The default returns the tail after the lookup value @, @jb51. Net

Summarize:

I believe that everyone through the study of this article, the PHP interception of strings have a certain understanding and understanding, and hope that your work has helped!

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