PHP string substitution function _php Tutorial

Source: Internet
Author: User
This article to PHP beginners to talk about two examples of PHP character substitution function, one is str_ireplace () one is substr_replace () These two functions are more useful, there is a need for reference.

String substitution techniques can be implemented using the following two common functions: the Str_ireplace () function and the Substr_replace () function
Str_ireplace () function
Replaces the string that is specified in the original string with the new substring, with the syntax:
Mixed str_ireplace (mixed search,mixed replace,mixed Subject[,int&count])
Parameter search: The necessary parameters, specifying the string to find.
Parameter replace: The required parameter, specifying the value to replace.
Parameter subject: Required parameter, specifies the scope of the lookup.
Parameter count: Optional parameter, (optional parameter with brackets), gets the number of execution substitutions.

Instance:

The code is as follows Copy Code
$str 2 = "xxx";
$STR 1 = "* *";
$str = "The address of a site is www.hzhuti.com, such as a website mainly record some learning PHP notes and impressions and a variety of software knowledge";
Echo Str_ireplace ($str 2, $str 1, $STR); STR2 Lookup value, str1 replacement value, str range
?>

In this example, we will demonstrate the str_ireplace () function with an array and a count variable:

The code is as follows Copy Code

$arr = Array ("Blue", "Red", "green", "yellow");
Print_r (Str_ireplace ("Red", "pink", $arr, $i));
echo "Replacements: $i";
?>

Output:

Array
(
[0] = Blue
[1] = Pink
[2] = Green
[3] = Yellow
)

replacements:1 Example 3

The code is as follows Copy Code

$find = Array ("Hello", "World");
$replace = Array ("B");
$arr = Array ("Hello", "World", "!");
Print_r (Str_ireplace ($find, $replace, $arr));
?> output:

Array
(
[0] = B
[1] = =
[2] = =!
)


Substr_replace () function
Replaces the partial string in the specified string with the syntax:
String Substr_replace (String str,string repl,int start,[int length])
Parameter str: Specifies the original string to manipulate.
Parameter REPL: The necessary parameter that specifies the new string after replacement.
Parameter start: Specifies where the replacement string begins.
Argument Length: Specifies the length of the string returned.
Instance:

copy code

"!--? php
substr_replace (' Eggs ', ' x ', -1,-1); EGGXS
substr_replace (' Eggs ', ' x ', -1,-2);//eggxs
Substr_replace (' Eggs ', ' x ', -1,-2);//eggxs
?> Same as :
!--? php
substr_replace (' Eggs ', ' x ', -1,0);//eggxs
.

!--? php
substr_replac E (' Huevos ', ' x ', -2,-2); Huevxos
Substr_replace (' Huevos ', ' x ', -2,-3);//huevxos
Substr_replace (' Huevos ', ' x ', -2,-3);//huevxos
? > Same as:

!--? php
substr_replace (' Huevos ', ' x ', -2,0);//huevxos
?

For more detailed information, please see: http://www.bKjia.c0m/phper/21/32954.htm

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