wppaste
WordPress

SMTP::xclient( array $vars ): bool

Source
wp-includes/PHPMailer/SMTP.php:1078
Send SMTP XCLIENT command to server and check its return code.

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.

Parameters

$varsarray

Return value

bool
True on success

Performance profile

How much work a call to SMTP::xclient() 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
Scales with input

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

Instructions
6–13

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 24.

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 one call costs · 2 distinct outcomes

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

WhenInstructionsCalls it makes
always6–7none
always12–13->sendCommand()

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev246–134
8.5246–134
8.4246–1343 fewer instructions than PHP 8.3
8.3276–134
8.2276–134
8.1276–134
7.4276–134

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

  • \PHPMailer\PHPMailer\SMTP::sendCommand()

Source code

View on Trac View on GitHub 

    public function xclient(array $vars)    {        $xclient_options = "";        foreach ($vars as $key => $value) {            if (in_array($key, SMTP::$xclient_allowed_attributes)) {                $xclient_options .= " {$key}={$value}";            }        }        if (!$xclient_options) {            return true;        }        return $this->sendCommand('XCLIENT', 'XCLIENT' . $xclient_options, 250);    }

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/PHPMailer/SMTP.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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