Summary: three methods for deleting the last character of a string in PHP and three methods for deleting the string

Summary: three methods for deleting the last character of a string in PHP and three methods for deleting the string

I. Preface

From databaseselect()When reading one-to-multiple information, you often need to split the retrieved array with a specific character and splice it into a string.

Common syntax formats:

 foreach ($arr as $key => $value) { $arr_str = $arr['x_id'] . ',' . $arr_str;     }

Assuming character array$arrThe characters in are

 arr[0] = 'a'; arr[1] = 'b'; arr[2] = 'c';

Then, the spliced$arr_str The string is a, B, c. At this time, we need to delete the last character.

Ii. Summary of how to delete the last character in PHP:

Method 1:

substr($arr_str,0,strlen($arr_str)-1);

Details:substr()Function Syntax:string substr ( string $string , int $start [, int $length ] )


strlen()Function Syntax:int strlen ( string $string )

Principles of this example:

Usestrlen()Function judgment string$arr_strAnd then usesubstr()Function pair$arr_strTo$arr_str. In this way, the last "," is removed.

Experience:

Not recommended. There are more simple and easy-to-use methods in php!

Method 2:

substr($arr_str, 0, -1) 

Details:Direct usesubstr()The function returns the last character in reverse order;

Usage experience: it is quite suitable ~~ However, you must first make sure that there is content in the string, and the last character must not!

Method 3:

rtrim($arr_str, ",") 

Details:rtrim()Function Syntax:string rtrim ( string $str [, string $character_mask ] )


Rtrim-removes white spaces (or other characters) at the end of a string)

Experience:

This is just for this demand!

Note:After the preceding method is used to operate a string, the operation result is returned and the string itself is not changed! Remember to use a variable to receive results!

Iii. Summary

The above is a summary of several methods for deleting the last character of a string in PHP. Have you learned this? I hope this article will help you in your study or work.