PHP · all questions

Object Oriented Concept
practice.

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141

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Q121

The pseudo-variable ...... is available inside any class method when that method is called from within an object context.

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Q122

A class may contain its own .............

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Q123

Child classes are defined using the keyword .....

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Q124

In PHP, the difference between double quote and single quote is that variables . . . . in single quoted strings whereas they . . . . . in double quoted strings.

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Q125

PHP strings are binary-safe (i.e. they can contain null bytes) . Their size is limited only by the amount of memory that is available to PHP.

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Q126

What is the output of below statement?

Print substr (‘watch out for that tree’,20,5);

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Q127

What is the value of var?

$var = 'HELLO WORLD!';
 $v a r <! - - ? s p an - - >< s p an c l a ss = " p - r e d " >=< / s p an > u c f i r s t < s p an c l a ss = " p - r e d " > (< / s p an >$ var);

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Q128

The functions strtolower() and strtoupper() work on individual characters and not on entire strings.

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Q129

Heredoc's are a great alternative to quoted strings because of increased readability and maintainability.

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Q130

Which of the below is most useful for debugging:

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Q131

What is the value of message?

$name = “John”;
 $m ess a g e < / s p an >< s p an c l a ss = " p - r e d " >=< / s p an > ‘ H e l l o,$ name’;

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Q132

The result of below statements will be:

$str = ""Hello fri3nd, you're
 feeling          happy today?”;
echo str_word_count($str);

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Q133

PHP recognises constructors by the name . . . . .

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Q134

In . . . . . constructors, it is important to remember that you have to call the parent constructor explicitly.

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Q135

Constructor and destructor methods have no . . . . . . and are called automatically - they cannot be called explicitly and consequently their declarations need no access specifier.

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Q136

Unlike constructors, you cannot pass information to a destructor, because you are never sure when its going to be run.

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Q137

You can invoke class constructors that don’t have any relation to the instantiated object by simply prefacing _constructor with the class name like.

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Q138

. . . . . . is a class which can only be instantiated once. You can effectively only have one object per . . . . . class in an application.

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Q139

Even if you don’t delete the object yourself using . . . . . , PHP still calls the destructor when it determines that the object is no longer used.

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Q140

You can overwrite a Singleton with the wrong kind of data.

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