STRTR string replacement usage in PHP, STRTR string _php Tutorial

STRTR string substitution usage in PHP, STRTR string

This example describes the use of STRTR string substitution in PHP. Share to everyone for your reference. The specific analysis is as follows:

STRTR (string,from,to) or STRTR (String,array)

First, for the first method of the STRTR function, let's look at the following example, the code is as follows:
Copy the Code code as follows: <?php
Echo strtr ("I Love You", "Lo", "Lo");
?>
The resulting results are:
1 I Love You
This result reminds us, 1.STRTR it is case-sensitive, 2.STRTR replacement is very special, you look at the back of that you, the middle O is replaced, this is obviously not our intention, and then give a special example, illustrate this PHP sttr function of the strange, the code is as follows:
Copy the Code code as follows: <?php
Echo strtr ("I Love You", "Love", "" ");
?>
The result is:
I Love You
Nothing will change, so STRTR need to note is: Can not be replaced with empty, that is, the final argument cannot be an empty string, of course, the space is possible, again example STRTR function of another case, the code is as follows:
Copy the Code code as follows: <?php
Echo strtr ("I Loves You", "Love", "Lovea");
?>
The running result is
1 I lOvEs You
Notice that a of the third parameter does not appear in the result.

I do not recommend using STRTR to change more, since this strtr function is very troublesome why use it? The reason is that it's fast, it is said, STRTR faster than str_replace four times times, so can use the STRTR function when must use, then how comfortable? This is the second case: Strtr (String,array)

STRTR the intended use method, the code is as follows:
Copy CodeThe code is as follows: <?php
$table _change = Array (' you ' + = ' her sister ');
Echo strtr ("I Love You", $table _change);
?>
The result is:
I Love her sister
Tip: You want to replace what you add to the array, such as the code is as follows:
Copy CodeThe code is as follows: <?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
Again remind that love is not possible to write a love, a mess to say a pass, in fact, about STRTR most want to say is the use of the back of the simple and convenient, seemingly behind the usage also ignore the character length of different questions, above PHP strtr function experiment, PHP5.2 test passed, The code is as follows:
Copy CodeThe code is as follows: <?php
This time the output is Baicai instead of Bai123cai, because str ("Pao")
Echo strtr ("paocai!", "Pao", "bai123");
?>
Example 2: When the replaced value is less than the target being replaced, the following is the referenced content, the code is as follows:
Copy CodeThe code is as follows: <?php
This time the output is Laocai instead of Lacai, because str ("Pao") >strlen ("La")
Echo strtr ("paocai!", "Pao", "la");
?>
Example 3: Support for array substitution, the following is the referenced content, the code is as follows:
Copy CodeThe code is as follows: <?php
$Arr =array (' ao ' = ' oa ', ' ai ' = ' ia ');
Echo strtr ("paocai!", $ARR); This time the output is Poacia
?>
Next is Str_replace, the following is the quoted content, the code is as follows:
Copy CodeThe code is as follows: <?php
Echo str_replace ("You", "Paocai", "I Love you!"); Will output I love paocai!
?>

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

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