Services_JSON::decode( string $str ): mixed

Compatibility

Deprecated in WordPress 5.3.0. Use the PHP native JSON extension instead.

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$strstring

JSON-formatted string

Return value

mixed

number, boolean, string, array, or object corresponding to given JSON input string.
See argument 1 to Services_JSON() above for object-output behavior.
Note that decode() always returns strings in ASCII or UTF-8 format!

Performance profile

How much work a call to Services_JSON::decode() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Light

Touches nothing outside its own arguments.

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

16–81

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 588.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What it touches

• hookthird-party callbacksdo_action()one call below Services_JSON::decode()

Further down the call graph this can also reach query, option, cache, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 5 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost Services_JSON::decode() can have, taken from its control-flow graph on PHP 8.5.

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Uses · 7

• _deprecated_function()Marks a function as deprecated and inform when it has been used.
• Services_JSON::reduce_string()reduce a string by removing leading and trailing comments and whitespace
• Services_JSON::substr8()Returns part of a string, interpreting $start and $length as number of bytes.
• Services_JSON::strlen8()Calculates length of string in bytes
• Services_JSON::utf162utf8()convert a string from one UTF-16 char to one UTF-8 char
• stdClass::__construct()
• Services_JSON::decode()decodes a JSON string into appropriate variable

Used by · 1

• Services_JSON::decode()decodes a JSON string into appropriate variable

Source code

View on Trac ↗View on GitHub ↗

638    function decode($str)639    {640        _deprecated_function( __METHOD__, '5.3.0', 'The PHP native JSON extension' );641 642        $str = $this->reduce_string($str);643 644        switch (strtolower($str)) {645            case 'true':646                return true;647 648            case 'false':649                return false;650 651            case 'null':652                return null;653 654            default:655                $m = array();656 657                if (is_numeric($str)) {658                    // Lookie-loo, it's a number659 660                    // This would work on its own, but I'm trying to be661                    // good about returning integers where appropriate:662                    // return (float)$str;663 664                    // Return float or int, as appropriate665                    return ((float)$str == (int)$str)666                        ? (int)$str667                        : (float)$str;668 669                } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {670                    // STRINGS RETURNED IN UTF-8 FORMAT671                    $delim = $this->substr8($str, 0, 1);672                    $chrs = $this->substr8($str, 1, -1);673                    $utf8 = '';674                    $strlen_chrs = $this->strlen8($chrs);675 676                    for ($c = 0; $c < $strlen_chrs; ++$c) {677 678                        $substr_chrs_c_2 = $this->substr8($chrs, $c, 2);679                        $ord_chrs_c = ord($chrs[$c]);680 681                        switch (true) {682                            case $substr_chrs_c_2 == '\b':683                                $utf8 .= chr(0x08);684                                ++$c;685                                break;686                            case $substr_chrs_c_2 == '\t':687                                $utf8 .= chr(0x09);688                                ++$c;689                                break;690                            case $substr_chrs_c_2 == '\n':691                                $utf8 .= chr(0x0A);692                                ++$c;693                                break;694                            case $substr_chrs_c_2 == '\f':695                                $utf8 .= chr(0x0C);696                                ++$c;697                                break;698                            case $substr_chrs_c_2 == '\r':699                                $utf8 .= chr(0x0D);700                                ++$c;701                                break;702 703                            case $substr_chrs_c_2 == '\\"':704                            case $substr_chrs_c_2 == '\\\'':705                            case $substr_chrs_c_2 == '\\\\':706                            case $substr_chrs_c_2 == '\\/':707                                if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||708                                   ($delim == "'" && $substr_chrs_c_2 != '\\"')) {709                                    $utf8 .= $chrs[++$c];710                                }711                                break;712 713                            case preg_match('/\\\u[0-9A-F]{4}/i', $this->substr8($chrs, $c, 6)):714                                // single, escaped unicode character715                                $utf16 = chr(hexdec($this->substr8($chrs, ($c + 2), 2)))716                                       . chr(hexdec($this->substr8($chrs, ($c + 4), 2)));717                                $utf8 .= $this->utf162utf8($utf16);

Changelog

Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/class-json.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

Something wrong on this page? Report it and it gets fixed in the next regeneration.