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面试准备

PHP 面试题与答案

Test your skills through the online practice test: PHP Quiz Online Practice Test

问题 6. Are objects passed by value or by reference?

Everything is passed by value.

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问题 7. How do you call a constructor for a parent class?

parent::constructor($value)

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问题 8. What's the special meaning of sleep and wakeup?

__sleep returns the array of all the variables than need to be saved, while __wakeup retrieves them.

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问题 9. Why doesn't the following code print the newline properly?                 $str = 'Hello, there.nHow are you?
            print $str;
    ?>

Because inside the single quotes the n character is not interpreted as newline, just as a sequence of two characters - and n.

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问题 10. Would you initialize your strings with single quotes or double quotes?

Since the data inside the single-quoted string is not parsed for variable substitution, it's always a better idea speed-wise to initialize a string with single quotes, unless you specifically need variable substitution.

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PHP 面试题与答案

相关差异对比

问题 6. Are objects passed by value or by reference?

问题 7. How do you call a constructor for a parent class?

问题 8. What's the special meaning of __sleep and __wakeup?

问题 9. Why doesn't the following code print the newline properly? $str = 'Hello, there.nHow are you? print $str; ?>

问题 10. Would you initialize your strings with single quotes or double quotes?

WithoutBook

问题 8. What's the special meaning of sleep and wakeup?

问题 9. Why doesn't the following code print the newline properly? $str = 'Hello, there.nHow are you?
print $str;
?>