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WordPress

AtomParser::parse()

Source
wp-includes/atomlib.php:148

Compatibility

WordPress
core
PHP
7.4–8.6-dev
  • 6.7.7
  • 6.8.8
  • 6.9.7
  • 7.0.4
  • 7.1.0

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

Performance profile

How much work a call to AtomParser::parse() 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
Heavy

Reads or writes the filesystem via fopen().

Scaling
Scales with input

The body loops, so the work grows with how much data it finds.

Instructions
89–125

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 125.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

  • filesystemfilesystem accessfopen()called directly

Further down the call graph this can also reach hook, 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 · 2 distinct outcomes

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

WhenInstructionsCalls it makes
always89array_unshift(), xml_parser_create_ns(), xml_parser_set_option(), xml_parser_set_option(), fopen(), fread(), fclose(), xml_parser_free(), restore_error_handler()
!xml_parse()123–125array_unshift(), xml_parser_create_ns(), xml_parser_set_option(), xml_parser_set_option(), fopen(), fread(), feof(), xml_parse(), __(), xml_get_error_code(), xml_error_string(), xml_get_current_line_number(), sprintf(), trigger_error(), fclose(), xml_parser_free(), restore_error_handler()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 125 instructions, 89–125 executed per call, 3 branches. The work does not change between versions.

An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.

Uses · 1

  • __()Retrieves the translation of $text.

Source code

View on Trac View on GitHub 

    function parse() {         set_error_handler(array(&$this, 'error_handler'));         array_unshift($this->ns_contexts, array());         if ( ! function_exists( 'xml_parser_create_ns' ) ) {        	trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );        	return false;        }         $parser = xml_parser_create_ns();        xml_set_element_handler($parser, array($this, "start_element"), array($this, "end_element"));        xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0);        xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,0);        xml_set_character_data_handler($parser, array($this, "cdata"));        xml_set_default_handler($parser, array($this, "_default"));        xml_set_start_namespace_decl_handler($parser, array($this, "start_ns"));        xml_set_end_namespace_decl_handler($parser, array($this, "end_ns"));         $this->content = '';         $ret = true;         $fp = fopen($this->FILE, "r");        while ($data = fread($fp, 4096)) {            if($this->debug) $this->content .= $data;             if(!xml_parse($parser, $data, feof($fp))) {                /* translators: 1: Error message, 2: Line number. */                trigger_error(sprintf(__('XML Error: %1$s at line %2$s')."\n",                    xml_error_string(xml_get_error_code($parser)),                    xml_get_current_line_number($parser)));                $ret = false;                break;            }        }        fclose($fp);         xml_parser_free($parser);        unset($parser);         restore_error_handler();         return $ret;    }

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 6.8.8 tag, from src/wp-includes/atomlib.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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