WP_Image_Editor_GD::crop( int $src_x, int $src_y, int $src_w, int $src_h, int $dst_w = null, int $dst_h = null, bool $src_abs = false )

Source

File: wp-includes/class-wp-image-editor-gd.php

public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false ) {
		// If destination width/height isn't specified,
		// use same as width/height from source.
		if ( ! $dst_w ) {
			$dst_w = $src_w;
		}
		if ( ! $dst_h ) {
			$dst_h = $src_h;
		}

		foreach ( array( $src_w, $src_h, $dst_w, $dst_h ) as $value ) {
			if ( ! is_numeric( $value ) || (int) $value <= 0 ) {
				return new WP_Error( 'image_crop_error', __( 'Image crop failed.' ), $this->file );
			}
		}

		$dst = wp_imagecreatetruecolor( (int) $dst_w, (int) $dst_h );

		if ( $src_abs ) {
			$src_w -= $src_x;
			$src_h -= $src_y;
		}

		if ( function_exists( 'imageantialias' ) ) {
			imageantialias( $dst, true );
		}

		imagecopyresampled( $dst, $this->image, 0, 0, (int) $src_x, (int) $src_y, (int) $dst_w, (int) $dst_h, (int) $src_w, (int) $src_h );

		if ( is_gd_image( $dst ) ) {
			imagedestroy( $this->image );
			$this->image = $dst;
			$this->update_size();
			return true;
		}

		return new WP_Error( 'image_crop_error', __( 'Image crop failed.' ), $this->file );
	}