Analysis of common php string processing function instances

This article mainly introduces common php string processing functions and analyzes the specific usage of functions such as chop (), get_html_translation_table (), htmlentities (), and htmlspecialchars () in the form of examples, PHP learning has some learning and reference value. if you need it, you can refer to the examples in this article to describe common php string processing functions. Share it with you for your reference. The specific analysis is as follows:

Here, only a few simple and common functions are provided:
Chop removes spaces. get_html_translation_table returns the conversion list to the variable. it defines the HTML-encoded string htmlentities, htmlspecialchars_decode, and defines the string containing special HTML characters, nl2br quotemeta rtrim, and so on.

Definition and usage: the chop () function deletes the white space or other pre-defined characters from the end of the string, the alias of the rtrim () function of the function.

Syntax: chop (string, charlist). The code is as follows:

The code is as follows:

$ Str = "I'm a teacher"; // define a string
$ Result = chop ($ str); // you can remove spaces.
Echo $ result; // output result

Definition and usage: the get_html_translation_table () function returns the translation table used by the htmlentities () and htmlspecialchars () functions.

Syntax: get_html_translation_table (function, quotestyle). The code is as follows:

The code is as follows:

$ Trans = get_html_translation_table (html_entities); // return the conversion list to the variable
Print_r ($ trans); // output conversion table
$ Str = "hallo & & Krmer "; // define a string
$ Encoded = strtr ($ str, $ trans); // search for characters
Echo $ encoded; // output result
//

$ Str = "a 'quote' is Bold"; // Define a string that includes html encoding
Echo htmlentities ($ str); // output the processed string
Echo htmlentities ($ str, ent_quotes); // output result after an optional parameter is added

//
$ Str ='

This->"

'; // Define a string containing special html characters
Echo htmlspecialchars_decode ($ str); // output the converted content
Echo"
";
Echo htmlspecialchars_decode ($ str, ent_noquotes); // output results without the quotation marks being encoded

//

$ Str = "cat isn't n dog"; // defines a string containing a linefeed.
$ Result = nl2br ($ str); // perform the conversion operation.
Echo $ result; // output the converted result

//

$ Str = "hello world. (can you hear me ?) "; // Define a string containing metacharacters
$ Result = quotemeta ($ str); // execute the conversion operation
Echo $ result; // output the converted result
//

$ Str = "hello world"; // defines a string with spaces at the end
$ Result = rtrim ($ str); // execute the conversion operation
Echo $ result; // output the converted result

I hope this article will help you with php programming.