Example analysis of common string processing functions in php

In this paper, the common string processing functions of php are described as examples. Share it for your reference. The specific analysis is as follows:

Here are only a few simple and commonly used functions:
chop performs a space removal process, get_html_translation_table returns a conversion list to a variable, defines a string htmlentities including HTML encoding, htmlspecialchars_decode defines a string including HTML special characters, nl2br quotemeta rtrim, etc.

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

Syntax: chop (string, charlist), code as follows:

$str="i'm a   teacher  ";          // Definition string  

$result=chop($str);           // Perform the stripping of spaces process  

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), code as follows:

$trans=get_html_translation_table(html_entities);    // Returns a conversion list to a variable  

print_r($trans);            // Output conversion table  

$str="hallo & <frau> & krmer";         // Definition string  

$encoded=strtr($str,$trans);         // Find character  

echo $encoded;           // Output result  

// 

 

$str="a 'quote' is <b>bold</b>";       // Definitions include html Encoded string  

echo htmlentities($str);        // Output a processed string  

echo htmlentities($str, ent_quotes);     // Output with optional parameters  

 

// 

$str='<p>this -&gt; "</p>';        // Definition contains html String of special characters  

echo htmlspecialchars_decode($str);     // Output the converted content  

echo "<br>"; 

echo htmlspecialchars_decode($str,ent_noquotes);  // Output without encoding quotation marks  

 

// 

 

$str="cat isn't n dog";      // Defines a string containing a newline character  

$result=nl2br($str);       // Perform a conversion operation  

echo $result;        // Output the converted result  

 

// 

 

$str="hello world.(can you hear me?)";      // Defining a string containing metacharacters  

$result=quotemeta($str);         // Perform a conversion operation  

echo $result;           // Output the converted result  

// 

 

$str="hello world  ";          // Defines a string with a space at the end  

$result=rtrim($str);          // Perform a conversion operation  

echo $result;           // Output the converted result 

I hope this article is helpful to everyone's php programming.