ThinkPHP is an excellent PHP open source framework, which simplifies the workload of developers and improves development efficiency. In ThinkPHP, the if statement is a common control flow statement. This article will introduce how to use if statements in ThinkPHP.

In ThinkPHP, the syntax format of the if statement is the same as the ordinary PHP if statement, but there are some subtle differences. The following is an example of a simple if statement:

if?($score?>=?60)?{
????echo?'及格了';
}?else?{
????echo?'沒有及格';
}

The above code indicates that if the value of the variable $score is greater than or equal to 60, the output is "passed", otherwise the output is "failed". This code is used in ThinkPHP exactly the same as a normal PHP if statement.

In addition, ThinkPHP also provides some shortcut functions related to if statements, which can help developers make complex conditional judgments more conveniently. Here are some commonly used functions:

1. is_null() function: determine whether a variable is null.

if?(is_null($variable))?{
????echo?'該變量為null';
}?else?{
????echo?'該變量不是null';
}

2. empty() function: Determine whether a variable is empty.

if?(empty($variable))?{
????echo?'該變量為空';
}?else?{
????echo?'該變量不為空';
}

3. isset() function: Determines whether a variable has been declared and the value is not null.

if?(isset($variable))?{
????echo?'該變量已聲明并且值不為null';
}?else?{
????echo?'該變量未聲明或者值為null';
}

In addition to the above three functions, ThinkPHP also provides a large number of shortcut functions, such as: in_array(), array_key_exists(), array_search(), etc. These functions can help developers make it more convenient Perform conditional judgment on arrays and variables.

In summary, the if statement in ThinkPHP is basically the same as the ordinary PHP if statement, except that it provides more shortcut functions in the extended function for developers to use. Mastering the usage of if statements is very helpful for complex conditional judgment and data processing in ThinkPHP.

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