PHP 置換
- 王林オリジナル
- 2024-08-29 12:49:391051ブラウズ
replace() 関数は、主に文字列を処理する PHP の関数で、置換する必要がある文字列の検索を実行することで任意の文字列を置換することを目的としています。文字列の検索パターンは、検索文字列全体を置換する必要がある方法、または指定された文字列または配列内の検索された置換文字列で置換できる配列にすることができます。 replace() 関数は、置換された値を持つ新しい文字列または配列を返す PHP の組み込み関数です。この関数は、search_val、replace_val、subject_val、count という 4 つのパラメーターまたは引数を必須で受け入れます。
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PHP replace の構文
以下に構文を示します:
str_replace(search_val, replace_val, subject_val, count)
構文の流れは、パラメーターが次のように表される方法です:
- search_val: search_val パラメータは文字列型と配列型の両方を表します。このパラメータは、検索し、検索された文字列で置き換える必要がある文字列を指定します。
- replace_val: replace_val パラメータは文字列型と配列型の両方を表します。このパラメータは、パラメータ search_val で検索された文字列を置き換える必要がある文字列を指定します。
- subject_val: subject_val パラメータは、replace_val で置換し、search_val で検索する必要がある文字列と配列型の両方を表します。
- count: count は、値が設定され、subject_val を使用して文字列に対して実行された置換操作の合計数に置き換えられるときに渡されるオプションの値です。
PHP で replace 関数はどのように機能しますか?
PHP のreplace() 関数は、指定された文字列内で置換する必要があるすべてのパラメータを置換するために使用される組み込み関数です。そのため、従う必要のあるいくつかの作業基準があります。
- Some mandatory function in PHP involves these parameters like search_val, replace_val, subject_val and count without which the working remains incomplete.
- Some very important criteria to be kept in mind, like if search_val with string and replace_val with string gets searched in the subject_val string then gets substituted by replace_val arguments string of the corresponding string and its arguments.
- If number of arguments in the element of replace_val comes out to be lesser than needed in search_val then it will be replacing the value or element with the empty string.
- The other case which arise and says for replacement also can include array or string with some values.
- Let’s consider the array or string with elements then the entire string will get searched within the subject_val.
- Count value also plays a very important role simultaneous to search_val and replace_val in a way that this argument tries to get passed from the function and its value will set to total number of operations performed for replacement of strings and that string should be string with subject_val.
- The return value for replace function() comes out to be a string i.e. a general string or the string can be string with all the occurrences of replaced value.
- This function is considered as case sensitive function but when compared to str_ireplace() function the str_ireplace() function performs a case-insensitive search.
- This function is considered binary safe as well.
- This function supports in a full fledge mode in versions 4+.
- The optional value of count has another significance which means count function is added in PHP version more than 5.0.
- Earlier Versions of PHP less than 4 involves function which involves quite a lot of complex functions such as find and replace which was indeed making the entire function of string find and replace very cumbersome. It will cause empty find indexes and interplay of internal pointers of arrays.
- All these complexities of find and replace got overcome with the count function being introduced in the PHP with versions 4+ .
- Search functionality and replace function needs lot of attention and focus as both will be used internally in order to perform the functionality with respect to the search operation.
- Sometimes there is a misconception between str_replace() method and str_ireplace() method but the difference is not much very minute difference lies with the fact that both seals with the case sensitive and case insensitive modes respectively.
- Overall string_replace() function works with four mandate parameters which provides re-usability and flexibility to programmers at the time of implementation.
Examples of PHP replace
Given below are the examples mentioned :
Example #1
This program demonstrates the replace() function in PHP which first finds for the string and then replaces the value of the string with some part as defined. It makes the entire php string replaced with some value as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>Let's Find for the string "Life_in_writing" and replace the value of writing with "Anusua"</p>
<?php
echo str_replace("writing","Anusua","Life_in_writing!");
?>
</body>
</html>
Output
Example #2
This program demonstrates an array of fruit which is trying to replace the particular value of the fruit like guava string with apple as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>Find the array with fruit guava and then substitute it with another fruit Apple.</p>
<?php
$ar_ray = array("guava","kiwi","apple","orange");
print_r(str_replace("guava","apple",$ar_ray,$k));
echo "<br>" . "replaced_fruit: $k";
?>
</body>
</html>
Output:
Example #3
This program demonstrates the substitution of string with elements and values of String with some subject_val string as the string value is less it will get substituted easily as show shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<?php
$search = array("Welcome","Everyone!");
$replace_str = array("Zee");
$arr_ay = array("Welcome","All",":)");
print_r(str_replace($search,$replace_str,$arr_ay));
?>
</body>
</html>
Output:
Example 4
This program demonstrates the ireplace_string() which acts as case insensitive when compared with the replace() function as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>find the string "All is good" and then make it replaced with the capital letter EVERYONE!</p>
<?php
echo str_ireplace("EVERYONE!","Anusua","All is good");
?>
</body>
</html>
Output:
Conclusion
PHP replace() is a function which gives programmers flexibility and scope of re-usability at the time of execution and lets user to use function for searching and replacing string accordingly. It gives users a view of implementation in terms of requirement when it comes to adopting the functionality. Overall a function which plays a significant role in PHP.
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