PHP array-one-to-single substitution implementation code the word between two positions is replaced by the * number

PHP Substr_replace will specify the characters between two positions to replace the code with the * number, the required friends can refer to below.

The code is as follows:

$username = "Zongzi"; Echo substr_replace ($username, ' * * ', ' 1 ', ' 2 ');

Definition and usage

The Substr_replace () function replaces part of a string with another string.

Grammar

Substr_replace (String,replacement,start,length)

Parameters	Description
String	Necessary. Specifies the string to check.
Replacement	Necessary. Specifies the string to insert.
Start	Necessary. Specifies where the string begins to be replaced. Positive number-starts with the first offset Negative number-replaces the start offset starting at the end of a string 0-Start the substitution at the first character in the string
Charlist	Optional. Specifies the number of characters to replace. Positive number-The length of the string being replaced Negative-the number of characters to be replaced starting at the end of the string 0-Insert rather than replace

Hints and Notes

Note: If start is negative and length is less than or equal to start, length is 0.
Example

The code is as follows:

<?php Echo substr_replace ("Hello World", "Earth", 6);?>

Output:
Hello Earth

The following methods can be implemented to match the key words and special processing functions, the code is as follows

<?php header ("content-type:text/html; Charset=utf-8 "); function Multiple_replace_words ($word, $replace, $string, $tmp _match= ' #a_a # ') {Preg_match_all ('/') $word. ' /', $string, $matches); Match all keywords $search = explode (', ', '/'. Implode ('/,/', $matches [0]). ' /'); There is no matching keyword if (empty ($matches [0])) return false; Special substitution Settings $count = count ($matches [0]); foreach ($replace as $key + $val) {if (!isset ($matches [0][$key]) unset ($replace [$key]);//Reject out-of-bounds substitution}//merge special substitution array with matching array for ($i =0; $i < $count; $i + +) {$matches [0][$i] = isset ($replace [$i])? $replace [$i]: $matches [0][$i];} $replace = $ Matches[0]; Prevents the replacement loop, that is, the replacement character is still the substituted character, at which time it temporarily replaces a specific character $tmp_match $replace = implode (', ', $replace); $replace = Str_replace ($word, $tmp _match, $replace); Temporary substitution of matching characters $replace = explode (', ', $replace); Replacement processing $string = Preg_replace ($search, $replace, $string, 1); Replaces only one $string in the array at a time = Str_replace ($tmp _match, $word, $string); Restores the temporary replacement of the matching character to return $string; }//Example 1 $string = ' aaabaaacaaadaaa '; $word = ' AAA '; $replace = Array (null, ' xxx ', ' yyy '); ECho ' original: '. $string. ' <br/> output: '. Multiple_replace_words ($word, $replace, $string). ' <br/><br/> '; Example 2 $string = ' Chinese aaab Chinese ccaaad Chinese eee '; $word = ' Chinese '; $replace = Array (null, ' (replace Chinese 2) ', ' (replace Chinese 3) '); Echo ' original: '. $string. ' <br/> output: '. Multiple_replace_words ($word, $replace, $string); /* Output: Original: Aaabaaacaaadaaa output: aaabxxxcyyydaaa Original: Chinese aaab Chinese ccaaad Chinese eee output: Chinese Aaab (replace Chinese 2) Ccaaad (replace Chinese 3) Eee//*/