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kord
answered Apr 25 '23 00:00
In PHP, str_replace() function is used to replace all occurrences of a substring with another substring in a given string. The function takes three parameters: the substring to search for, the substring to replace with, and the string to search and replace within.
However, there are certain special characters that have a special meaning in the replacement string, such as $, \, and {} . To use these characters literally in the replacement string, they must be escaped with a backslash \.
For example, let's say we have a string "Hello, $name!" If we want to replace $name with the value of a variable $username, we can use the following code:
$name = "John";
$string = "Hello, $name!";
$replacement = "world";
$new_string = str_replace("$name", $replacement, $string);
echo $new_string; // Output: "Hello, world!"
However, if we want to replace $name with the string literal $username , we need to escape the $ character in the replacement string:
$name = "John";
$string = "Hello, $name!";
$replacement = "\$username";
$new_string = str_replace("$name", $replacement, $string);
echo $new_string; // Output: "Hello, $username!"
In this example, we have escaped the $ character in the replacement string using a backslash, so it is interpreted literally rather than as a variable reference.
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