If you're frustrated with Search (a.k.a. Desktop Search), you are not alone. Click the Start button and type in Search and click on the command "Change how Windows searches". Now click on the Advanced button and select File types tab. Scroll down and locate your file type (in your case **.php)**and make sure that the radio button "Index Properties and File Contents" is selected for the file type.
Come out of the form by clicking the OK button but do not yet close the form where you clicked the Advanced button.
Next, you may need to modify the indexing locations. If the folder wherein your files are located is not known to the search indexing, then search doesn't even bother to look there (a source of frustration for many users). Perhaps your files are on a different disk or partition unbeknown to the indexing engine. Using the expand icon and select/deselect options, make sure that at least the folders of interest are included to the Indexed Locations. Hope this helps.
samc1