w3resource

PHP: addslashes() function

Description

The addslashes() function is used to add backslashes in front of the characters that need to be quoted. The predefined characters are single quote ('), double quote("), backslash(\) and NULL (the NULL byte).

Version:

(PHP 4 and above)

Syntax:

addslashes(string_name)

Parameter:

Name Description Required /
Optional
Type
string_name The specified string. Required String

Return values:

The escaped string.

Value Type: String.

Pictorial Presentation:

php-string-addslashes()

Example:

<?php
echo addslashes("I will n't go there.");
echo '<br>';
echo addslashes('"Thank" You');
?>

Output:

I will n\'t go there.
\"Thank\" You 

View the example in the browser

See also

PHP Function Reference

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PHP: Tips of the Day

PHP: Using str_replace so that it only acts on the first match?

Can be done with preg_replace:

function str_replace_first($from, $to, $content)
{
    $from = '/'.preg_quote($from, '/').'/';

    return preg_replace($from, $to, $content, 1);
}

echo str_replace_first('abc', '123', 'abcdef abcdef abcdef'); 
// outputs '123def abcdef abcdef'

The magic is in the optional fourth parameter [Limit]. From the documentation:

[Limit] - The maximum possible replacements for each pattern in each subject string. Defaults to -1 (no limit).

Ref : https://bit.ly/35SCuP8