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WP_Tax_Query::get_sql_clauses(): string[]

Since
4.1.0
Source
wp-includes/class-wp-tax-query.php:269
Generates SQL clauses to be appended to a main query.

Description

Called by the public WP_Tax_Query::get_sql(), this method is abstracted out to maintain parity with the other Query classes.

Compatibility

WordPress
since 4.1.0
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.

Return value

string[]
Array containing JOIN and WHERE SQL clauses to append to the main query.

  • $joinstring

    SQL fragment to append to the main JOIN clause.

  • $wherestring

    SQL fragment to append to the main WHERE clause.

Performance profile

How much work a call to WP_Tax_Query::get_sql_clauses() 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
Trivial

Touches nothing outside its own arguments.

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
8–12

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 12.

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 one call costs · 1 distinct outcome

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

WhenInstructionsCalls it makes
always8–12->get_sql_for_query()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 12 instructions, 8–12 executed per call, 1 branch. 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

Used by · 1

Source code

View on Trac View on GitHub 

	protected function get_sql_clauses() {		/*		 * $queries are passed by reference to get_sql_for_query() for recursion.		 * To keep $this->queries unaltered, pass a copy.		 */		$queries = $this->queries;		$sql     = $this->get_sql_for_query( $queries ); 		if ( ! empty( $sql['where'] ) ) {			$sql['where'] = ' AND ' . $sql['where'];		} 		return $sql;	}

Changelog

Introduced in 4.1.0. 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 7.0.4 tag, from src/wp-includes/class-wp-tax-query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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