Quick Answer: What is a flag in PHP?

What is flag in programming?

In programming, a flag is a predefined bit or bit sequence that holds a binary value. Typically, a program uses a flag to remember something or to leave a sign for another program.

What is flag variable?

A flag variable is a source data variable that has been identified as a way to indicate the clinical significance of lab test or vital sign values or to indicate whether adverse events are treatment-emergent. Often, the specified value is for a supplemental qualifier variable in study data.

What is a flag in computer architecture?

The Flag register is a Special Purpose Register. Depending upon the value of result after any arithmetic and logical operation the flag bits become set (1) or reset (0). … If the MSB is 0, it indicates the number is positive and the sign flag becomes reset i.e. 0.

What is flag in MySQL?

Used to indicate whether a binary log file was closed properly. … It is set when the event is written to the log file. When the log file is closed later, the flag is cleared. (This is the only case when MySQL modifies an already written part of a binary log file).

Why flag is used in C?

Flag variable is used as a signal in programming to let the program know that a certain condition has met. It usually acts as a boolean variable indicating a condition to be either true or false.

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What is the purpose of the flag?

Flags originally were used mainly in warfare, and to some extent they have remained insignia of leadership, serving for the identification of friend or foe and as rallying points. They are now also extensively employed for signaling, for decoration, and for display.

What is a flag value?

In computer science, a flag is a value that acts as a signal for a function or process. The value of the flag is used to determine the next step of a program. Flags are often binary flags, which contain a boolean value (true or false).

What is the flag for DC?

The flag of Washington, D.C., consists of three red stars above two red bars on a white background. It is an armorial banner based on the design of the coat of arms granted to George Washington’s great-great-great-grandfather, Lawrence Washington of Sulgrave Manor, Northamptonshire, England in 1592.

What is flag and its types?

Status Flags

Flag Bit Function
Z If the total register is zero, then only the Z flag is set
AC When some arithmetic operations generates carry after the lower half and sends it to upper half, the AC will be 1
P This is even parity flag. When result has even number of 1, it will be set to 1, otherwise 0 for odd number of 1s

What is a flag in PLC?

A flag is one or more data bits used to store binary values as specific program structure indicators. … A computer interprets a flag value in relative terms or based on the data structure presented during processing, and uses the flag to mark a specific data structure.

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