POP3::send_cmd( $cmd = "" )
- Source
wp-includes/class-pop3.php:447
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
$cmdoptional- Default:
""
Performance profile
How much work a call to POP3::send_cmd() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Heavy
- Scaling
- Constant
- Instructions
- 10–37
- Plugin surface
- None
- Called by
- 9
Reads or writes the filesystem via fwrite().
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 51.
Nothing here hands control to plugin code.
9 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- filesystemfilesystem access
fwrite()called directly
What one call costs · 3 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost POP3::send_cmd() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 10–12 | _() |
isset($value) && !empty($cmd) | 26 | ->update_timer(), fwrite(), fgets(), ->strip_clf() |
isset($value) && !empty($cmd) | 37 | ->update_timer(), fwrite(), fgets(), ->strip_clf(), error_log() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 51 instructions, 10–37 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 · 3
- _()Compat function to mimic _(), an alias of gettext().
- POP3::update_timer()
- POP3::strip_clf()
Used by · 9
Source code
function send_cmd ( $cmd = "" ) { // Sends a user defined command string to the // POP server and returns the results. Useful for // non-compliant or custom POP servers. // Do NOT include the \r\n as part of your command // string - it will be appended automatically. // The return value is a standard fgets() call, which // will read up to $this->BUFFER bytes of data, until it // encounters a new line, or EOF, whichever happens first. // This method works best if $cmd responds with only // one line of data. if(!isset($this->FP)) { $this->ERROR = "POP3 send_cmd: " . _("No connection to server"); return false; } if(empty($cmd)) { $this->ERROR = "POP3 send_cmd: " . _("Empty command string"); return ""; } $fp = $this->FP; $buffer = $this->BUFFER; $this->update_timer(); fwrite($fp,"$cmd\r\n"); $reply = fgets($fp,$buffer); $reply = $this->strip_clf($reply); if($this->DEBUG) { @error_log("POP3 SEND [$cmd] GOT [$reply]",0); } return $reply; }Changelog
Unchanged from 6.7.7 through 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-pop3.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.