PHP preguntas y respuestas de entrevista
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Pregunta 6. Are objects passed by value or by reference?
Everything is passed by value.
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Pregunta 7. How do you call a constructor for a parent class?
parent::constructor($value)
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Pregunta 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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Pregunta 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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Pregunta 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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