PHP 面试题与答案
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相关差异对比
问题 1. When are you supposed to use endif to end the conditional statement?
When the original if was followed by : and then the code block without braces.
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问题 2. Explain the ternary conditional operator in PHP?
Expression preceding the ? is evaluated, if it's true, then the expression preceding the : is executed, otherwise, the expression following : is executed.
E.g $id = isset($_GET['id']) ? $_GET['id'] : false;
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问题 3. How do I find out the number of parameters passed into function?
func_num_args() function returns the number of parameters passed in.
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问题 4. If the variable $a is equal to 5 and variable $b is equal to character a, what's the value of $$b?
100, it's a reference to existing variable.
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问题 5. What's the difference between accessing a class method via -> and via ::?
:: is allowed to access methods that can perform static operations, i.e. those, which do not require object initialization.
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