Core PHP Programming: Using PHP to Build Dynamic Web Sites

Miscellaneous Operators

There are operators that don't fit into any of the previous categories: the concatenation operator, the variable marker, the reference operator, and others. Table 2.9 lists them.

The concatenation operator is similar to the addition operator except that it joins two strings. I find this operator indispensable. When issuing a print, it is convenient to concatenate several strings. I also use the concatenation operator to build database queries. Listing 2.8 is an example of doing this.

When variables were discussed earlier, it was shown that a dollar sign always precedes the name of a variable. This is true whether the variable is global, local, or a function argument. The operator can be taken to mean, "Use the value stored ...