PHP string replacement function strtr () implementation _ PHP Tutorial

PHP string replacement function strtr. What we want to talk about today is about the two statuses strtr (string, from, to) of the php string replacement function strtr) or strtr (string, arr. what we want to talk about today isLet's take a look at the two statuses of the php string replacement function PHP string replacement function strtr ().

Strtr (string, from,)

Or strtr (string, array)

First, the first method for replacing the strtr () function with a PHP string

Let's take a look at the example below:

 
 

  
  
 php 
  
  
echo strtr("I Love you","Lo","lO"); 
  
  
?> 
 
 

The result is:

I lOve yOu

This result reminds us

1. strtr: it is case sensitive.

2. the replacement of strtr () in the PHP string replacement function is very special. yOu should note that yOu and the O in the middle are replaced later. this is obviously not our intention.

Here is another special example to show how strange this php sttr function is.

 
 

  
  
 php 
  
  
echo strtr("I Love you","Love",""); 
  
  
?> 
 
 

The result is

I Love you

Nothing will change, so strtr should note that:

3. cannot be replaced with Null, that is, the last parameter cannot be a null string. of course, spaces are acceptable.

Another example of replacing strtr () with a PHP string

 
 

  
  
<,balencigag handbag;?php 
  
  
echo strtr("I Loves you","Love","lOvEA"); 
  
  
?> 
 
 

The result is

I lOvEs yOu

Note that A of the third parameter does not appear in the result.

4. I do not recommend replacing the strtr () function with a PHP string

Okay. why should I use this strtr function?

The reason is that it is fast

It is said that strtr is four times faster than str_replace

5. Be sure to use the strtr function.

How can it be used for comfort?

This is the second case.

Strtr (string, array)

6. PHP string replacement function strtr ()

 
 

  
  
 php 
  
  
$table_change = array('you'=>'her sister'); 
  
  
echo strtr("I Love you",$table_change); 
  
  
?> 
 
 

Result:

I Love her sister

7. tips: If you want to replace something, add it to the array.

 
 

  
  
 php 
  
  
$table_change = array('you'=>'her sister'); 
  
  
$table_change += array('Love' => 'hate'); 
  
  
echo strtr("I Love you",$table_change); 
  
  
?> 
 
 

The result is

I hate her sister

Remind me again that writing Love is not feasible.

Okay. let's talk about it in a mess. In fact, what strtr wants to talk about is the subsequent usage.

Simple and convenient.

It seems that the subsequent usage also ignores the problem of different front and back character lengths.

The above PHP string replacement function strtr () experiment, PHP5.2 test passed.

Let's take a look at this php string replacement function PHP string replacement function strtr () two statuses of strtr (string, from, to) or strtr (string, arr...