get_image_tag( int $id, string $alt, string $title, string $align, string|int[] $size = 'medium' ): string

Description

Compatibility

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

Parameters

$idint

Attachment ID.

$altstring

Image description for the alt attribute.

$titlestring

Image description for the title attribute.

$alignstring

Part of the class name for aligning the image.

$sizestring|int[]optional

Image size. Accepts any registered image size name, or an array of width and height values in pixels (in that order). Default 'medium'.Default: 'medium'

Return value

string

HTML IMG element for given image attachment.

Performance profile

How much work a call to get_image_tag() 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

69–75

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 77.

Plugin surface

2 hooks

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

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What it touches

• hookthird-party callbacksapply_filters()called directly

Further down the call graph this can also reach 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 get_image_tag() can have, taken from its control-flow graph on PHP 8.5.

Hooks and filters fired · 2

2 hooks fire while get_image_tag() runs, in this order:

1. 1
   apply_filters( get_image_tag_class )filterline 404 (+21 into the body)

   Filters the value of the attachment's image tag class attribute.

2. 2
   apply_filters( get_image_tag )filterline 421 (+38 into the body)

   Filters the HTML content for the image tag.

Uses · 5

• image_downsize()Scales an image to fit a particular size (such as 'thumb' or 'medium').
• image_hwstring()Retrieves width and height attributes using given width and height values.
• esc_attr()Escaping for HTML attributes.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• esc_url()Checks and cleans a URL.

Used by · 1

• get_image_send_to_editor()Retrieves the image HTML to send to the editor.

Source code

View on Trac ↗View on GitHub ↗

383function get_image_tag( $id, $alt, $title, $align, $size = 'medium' ) {384 385	list( $img_src, $width, $height ) = image_downsize( $id, $size );386	$hwstring                         = image_hwstring( $width, $height );387 388	$title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';389 390	$size_class = is_array( $size ) ? implode( 'x', $size ) : $size;391	$class      = 'align' . esc_attr( $align ) . ' size-' . esc_attr( $size_class ) . ' wp-image-' . $id;392 393	/**394	 * Filters the value of the attachment's image tag class attribute.395	 *396	 * @since 2.6.0397	 *398	 * @param string       $class CSS class name or space-separated list of classes.399	 * @param int          $id    Attachment ID.400	 * @param string       $align Part of the class name for aligning the image.401	 * @param string|int[] $size  Requested image size. Can be any registered image size name, or402	 *                            an array of width and height values in pixels (in that order).403	 */404	$class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );405 406	$html = '<img src="' . esc_url( $img_src ) . '" alt="' . esc_attr( $alt ) . '" ' . $title . $hwstring . 'class="' . $class . '" />';407 408	/**409	 * Filters the HTML content for the image tag.410	 *411	 * @since 2.6.0412	 *413	 * @param string       $html  HTML content for the image.414	 * @param int          $id    Attachment ID.415	 * @param string       $alt   Image description for the alt attribute.416	 * @param string       $title Image description for the title attribute.417	 * @param string       $align Part of the class name for aligning the image.418	 * @param string|int[] $size  Requested image size. Can be any registered image size name, or419	 *                            an array of width and height values in pixels (in that order).420	 */421	return apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );422}

Changelog

Introduced in 2.5.0. 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

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