Use the string truncation function in php to delete a string from the end.

Fixed a bug in obtaining the controller name.

The controller names end with act and delete act when using it.

1. Original method

// Use the act replacement method to obtain the controller name. Obviously, when the controller name contains three characters of act, it will be replaced with the bug $ actName = str_replace ('AC ', '', 'ad _ client_contactact ');

Controller name ad_client_cont

2. Solution

// Delete three strings from the end

$ ActName = substr ('ad _ client_contactact ', 0,-3 );

Controller name ad_client_contact

1. Truncate from 4th characters to the end of the string, similar to left in asp:

<? Php $ str = "www. Icoa. Cn "; echo substr ($ str, 4) ;?> Output: icoa. Cn

2. The PHP substr function intercepts three characters from the right side, similar to the right in asp:

<? Php $ str = "www. Icoa. Cn "; echo substr ($ str,-3);?> Output :. Cn

3. The PHP substr function intercepts 3 characters from 4th characters:

<? Php $ str = "www. Icoa. Cn "; echo substr ($ str, 4,3) ;?> Output: ico

4. Sometimes we know the start and end of a string, which is an indefinite character in the middle, in this case, we can use substr in addition to the regular expression of the PHP substr function (of course, there are N character methods to be obtained in the middle. Here is just an example of the substr application ):

In this example, the first 4 characters and the last 3 characters are removed, and the intermediate string is output:

<? Php $ str = "www. Icoa. Cn "; echo substr ($ str, 4,-3);?> Output: icoa

5. View Chinese characters

$ A = "straight, vertical, horizontal, square," $ a = substr ($ a, 0,-1); the output result is: straight, vertical, horizontal, and Square

6. Search for the specified string and delete it.

$ A = "abcababa"; $ count = strpos ($ a, "AB"); $ str = substr_replace ($ a, "", $ count, 2); output result: cababa

The code is short, but it is also a small algorithm!

7. Delete any character in the string.

Function delStr ($ start, $ end, $ orgenStr) {// read the first part of the string to be deleted, and assigned to $ temp // the position at which the strpos character is read for the first time. // substr reads the substring at the specified start and end positions. // echo $ before. "-". $ last; $ temp = $ orgenStr; while (strpos ($ temp, $ start) & strpos ($ temp, $ end) {$ temp = substr ($ temp, 0, strpos ($ temp, $ start )). substr ($ temp, strpos ($ temp, $ end) + strlen ($ end); // read the last part of the string to be deleted, and connect the front and back parts, and assign $ temp // return the final string} return $ temp;} // application instance $ a = "aaaa12345678bbbbtttttttttttttttttttttttaaaa12345678bbbb success"; $ B = "1234 "; $ c = "5678"; echo delStr ($ B, $ c, $ );