... floating-point (usuallycalled “float”; a fractional number), string (a set of characters), array (a group of data), object (a complex mix of data and functionality), or a resource (anyexternal information, ... reserved.What those commands will give you is a working installation of Apache (installedinto /usr/local/apache2) and a working installation of PHP in /usr/local/lib/php. The two are not joined as yet, ... “variable vari-ables,” which are covered in the next chapter. A list of valid and invalid variablenames is shown in Table 4-1 .Variables are case-sensitive, which means that$Foo is not the...