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is_gd_image()

is_gd_image( resource|GdImage|false   $image  ): bool

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Determines whether the value is an acceptable type for GD image functions.

Description

In PHP 8.0, the GD extension uses GdImage objects for its data structures.
This function checks if the passed value is either a GdImage object instance or a resource of type gd . Any other type will return false.

Parameters

$image resource | GdImage | false required
A value to check the type for.

Return

bool True if $image is either a GD image resource or a GdImage instance, false otherwise.

Source

 function is_gd_image( $image ) { if ( $image instanceof GdImage || is_resource( $image ) && 'gd' === get_resource_type( $image ) ) { return true; } return false; }

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Used by Description
image_edit_apply_changes() wp-admin/includes/image-edit.php

Performs group of changes on Editor specified.

load_image_to_edit() wp-admin/includes/image.php

Loads an image resource for editing.

wp_load_image() wp-includes/deprecated.php

Load an image from a string, if PHP supports it.

WP_Image_Editor_GD::load() wp-includes/class-wp-image-editor-gd.php

Loads image from $this->file into new GD Resource.

WP_Image_Editor_GD::resize() wp-includes/class-wp-image-editor-gd.php

Resizes current image.

WP_Image_Editor_GD::_resize() wp-includes/class-wp-image-editor-gd.php
WP_Image_Editor_GD::crop() wp-includes/class-wp-image-editor-gd.php

Crops Image.

WP_Image_Editor_GD::rotate() wp-includes/class-wp-image-editor-gd.php

Rotates current image counter-clockwise by $angle.

WP_Image_Editor_GD::flip() wp-includes/class-wp-image-editor-gd.php

Flips current image.

wp_imagecreatetruecolor() wp-includes/media.php

Creates a new GD image resource with transparency support.

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Changelog

Version Description
5.6.0 Introduced.

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