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Add a set of helpers to turn the behaviour of mbstring.func_overload off when needed. Fixes #25259 

Built from https://develop.svn.wordpress.org/trunk@25346


git-svn-id: http://core.svn.wordpress.org/trunk@25308 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Dion Hulse 2013-09-11 07:23:08 +00:00
parent 1536779aaf
commit ca008522f3
1 changed files with 51 additions and 0 deletions
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51
wp-includes/functions.php
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@ -4130,3 +4130,54 @@ function _canonical_charset( $charset ) {
return $charset;
}
/**
* Sets the mbstring internal encoding to a binary safe encoding whne func_overload is enabled.
*
* When mbstring.func_overload is in use for multi-byte encodings, the results from strlen() and
* similar functions respect the utf8 characters, causing binary data to return incorrect lengths.
*
* This function overrides the mbstring encoding to a binary-safe encoding, and resets it to the
* users expected encoding afterwards through the `reset_mbstring_encoding` function.
*
* It is safe to recursively call this function, however each `mbstring_binary_safe_encoding()`
* call must be followed up with an equal number of `reset_mbstring_encoding()` calls.
*
* @see reset_mbstring_encoding()
*
* @since 3.7.0
*
* @param bool $reset Whether to reset the encoding back to a previously-set encoding.
*/
function mbstring_binary_safe_encoding( $reset = false ) {
static $encodings = array();
static $overloaded = null;
if ( is_null( $overloaded ) )
$overloaded = function_exists( 'mb_internal_encoding' ) && ( ini_get( 'mbstring.func_overload' ) & 2 );
if ( false === $overloaded )
return;
if ( ! $reset ) {
$encoding = mb_internal_encoding();
array_push( $encodings, $encoding );
mb_internal_encoding( 'ISO-8859-1' );
}
if ( $reset && $encodings ) {
$encoding = array_pop( $encodings );
mb_internal_encoding( $encoding );
}
}
/**
* Resets the mbstring internal encoding to a users previously set encoding.
*
* @see mbstring_binary_safe_encoding()
*
* @since 3.7.0
*/
function reset_mbstring_encoding() {
mbstring_binary_safe_encoding( true );
}