Exclamation mark in front of variable - clarification needed. I've been working with PHP for quite a while now, but this was always a mystery to me, the correct use of the exclamation mark (negative sign) in front of variables. What does !$var indicate? Is var false, empty, not set etc.?
Lancaster is a city in Dallas County, Texas, United States. The population was 25,894 at the 2000 census. Locally, Lancaster is pronounced LANK-ist-er or LANK-us-ter, it is often mispronounce as LAN-CAS-ter. Lancaster is a suburb of Dallas, Texas and is part of the Best Southwest area, which includes Lancaster, Cedar Hill, DeSoto, and Duncanville. Most of the city is in Dallas County. But a extremely small southern section spills over into Ellis County.
Harker Heights is a city in Bell County, Texas, United States. The population was 17,308 at the 2000 census. This makes Harker Heights the 3rd largest city in Bell County, after Killeen and Temple. Incorporated in 1960, the city name is derived from the name of one of the two original landowners and founder, Harley Kern. Harker Heights is part of the KilleenâTempleâFort Hood Metropolitan Statistical Area.