Setting Labels to Variables, Objects and Watches
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You can add your own label to a variable, object, or watch and then reference it as if it were a local variable
<label-name>_DebugLabel defined in the same context where the expression is evaluated. PhpStorm also displays these labels in suggestion pop-up lists for code completion in the Evaluate Expression dialog box.
Settings and removing labels
To set a label
Select the desired watch in the list
Select Mark Object on the context menu or press F11. The Select object label dialog box opens.
Specify the label name.
Click Browse to change the label color. Click OK when ready.
To remove a label, right-click the item and select Unmark Object on the context menu, or select the item in the list and press F11.