wppaste
WordPress

wp_create_thumbnail( mixed $file, int $max_side, mixed $deprecated = '' ): string

Since
1.2.0
Source
wp-admin/includes/deprecated.php:1135
This was once used to create a thumbnail from an Image given a maximum side size.

Compatibility

Deprecated in WordPress 3.5.0. Use image_resize()

WordPress
since 1.2.0
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.

Parameters

$filemixed
Filename of the original image, Or attachment ID.
$max_sideint
Maximum length of a single side for the thumbnail.
$deprecatedmixedoptional
Never used.Default: ''

Return value

string
Thumbnail path on success, Error string on failure.

Performance profile

How much work a call to wp_create_thumbnail() 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
18

Executed per call on PHP 8.5. The body compiles to 18.

Plugin surface
1 hook

Third-party callbacks on 'wp_create_thumbnail' run inside this call, and their cost is not bounded by anything here.

Called by
0

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

What it touches

  • hookthird-party callbacksapply_filters()called directly

Further down the call graph this can also reach cache, query, option, 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 · 1 distinct outcome

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

WhenInstructionsCalls it makes
always18_deprecated_function(), image_resize(), apply_filters()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 18 instructions, 18 executed per call, 0 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.

Hooks and filters fired · 1

One hook fires while wp_create_thumbnail() runs, in this order:

  1. apply_filters( wp_create_thumbnail )filterline 1137 (+2 into the body)

Uses · 3

  • _deprecated_function()Marks a function as deprecated and inform when it has been used.
  • apply_filters()Calls the callback functions that have been added to a filter hook.
  • image_resize()Scale down an image to fit a particular size and save a new copy of the image.

Source code

View on Trac View on GitHub 

function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {	_deprecated_function( __FUNCTION__, '3.5.0', 'image_resize()' );	return apply_filters( 'wp_create_thumbnail', image_resize( $file, $max_side, $max_side ) );}

Changelog

Introduced in 1.2.0. 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.

3.5.0
Deprecated. Use image_resize()from the docblock
1.2.0
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 6.8.8 tag, from src/wp-admin/includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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