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PHP get_html_translation_table() Function

The get_html_translation_table() function in PHP is used to retrieve the translation table used by the htmlspecialchars() and htmlentities() functions. This function returns an associative array that maps special characters to their corresponding HTML entities or vice versa.

The basic syntax of the get_html_translation_table() function is as follows:

get_html_translation_table([int $table = HTML_SPECIALCHARS [, int $flags = ENT_COMPAT | ENT_HTML401 [, string|null $encoding = null [, bool $double_encode = true ]]]]): array

The function accepts four optional parameters:

  • $table: Specifies the type of translation table to retrieve. The default value is HTML_SPECIALCHARS, which returns the table for converting special characters to their HTML entities. Alternatively, you can use HTML_ENTITIES to get the table for converting both special characters and characters outside the ASCII range.
  • $flags: Defines the behavior of the translation table. The default value is ENT_COMPAT | ENT_HTML401, which uses the HTML 4.01 character set and converts double quotes. Other possible flag values include ENT_QUOTES, ENT_NOQUOTES, ENT_HTML5, ENT_XML1, ENT_XHTML, and ENT_DISALLOWED.
  • $encoding: Specifies the character encoding to use. If not provided, the default encoding of the script will be used.
  • $double_encode: Determines whether existing HTML entities should be encoded again. By default, it is set to true, meaning existing entities will be encoded.

The get_html_translation_table() function returns an associative array where the keys are the special characters or HTML entities, and the values are their corresponding translations.

Here’s an example usage of the get_html_translation_table() function:

$table = get_html_translation_table(HTML_SPECIALCHARS);

This example retrieves the translation table for converting special characters to their HTML entities and outputs the resulting array using print_r(). The output will display the special characters as keys and their corresponding HTML entities as values.

Note that the get_html_translation_table() function is mainly used internally by PHP for the htmlspecialchars() and htmlentities() functions. However, you can also use it directly if you need to access the translation table for other purposes.

Keep in mind that the translation table may differ depending on the version of PHP and the specific character sets being used. It’s always a good practice to check the official PHP documentation for accurate and up-to-date information regarding this function.