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This article mainly introduces how to use the ternary operator in php, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

In php, the ternary operator is used to select and execute one of the other two expressions based on the result of the first expression, syntax "(expr1)? (expr2): (expr3);"; if the first expression "expr1" holds, the second expression "expr2" is executed, otherwise the "expr3" expression is executed.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In PHP, ternary operators, also known as ternary operators or conditional operators, can achieve a simple function of conditional judgment, that is, one of the other two expressions is selected and executed according to the result of the first expression.

The function of the ternary operator is the same as the "if else" statement, it can be written on one line, the code is concise and the execution is more efficient. Proper use of ternary operators in PHP programs can make scripts more concise and efficient.

The syntax format of the ternary operator is as follows:

(expr1)? (expr2): (expr3); / / expression 1? Expression 2: expression 3

If the condition "expr1" holds, the statement "expr2" is executed, otherwise "expr3" is executed.

The sample code is as follows:

The running results are as follows:

An is an even number!

Alternatively, expr2 and expr3 can omit either single quotation mark ('') or double quotation mark ("") to avoid unnecessary code, as follows:

The running results are as follows:

An is an even number! $b is odd!

Note: if you need to print a string when using the ternary operator, it is recommended that you use the print statement instead of the echo statement.

Not only that, the ternary operator can be extended to execute more than one statement when the set condition is true or not, and the syntax format is as follows:

(expr1)? (expr2). (expr3): (expr4). (expr5)

As you can see, the string operator can be used between multiple execution statements. Concatenated, each execution statement is wrapped in parentheses to indicate that it is a separate and complete execution statement.

At the same time, ternary operators can also be nested, as shown in the following example:

Note that the assignment on the fifth line waits for the ternary operator to be executed.

The running results are as follows:

$x = 2

Although the ternary operator used in nesting can save a lot of code, it is not very readable, and it is not convenient to maintain the code in the future, so we try to use if else statements in this case.

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