Answer Posted / luan nguyen

you get header already sent when you call header() after you
have posted other data to the browsers.
Example:

<?php

echo "Hello World";
header("Location: http://new.url.com");

?>

Is false empty php?

942

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Does php 7 support multiple inheritance?

935

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Write down the code for save an uploaded file using php?

890

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What are the main error types in php?

1008

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Why constructor is not overridden?

920

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Swap two variables value without using third variable in php ?

1006

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What is csrf token and how will you add csrf token in ajax?

907

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What are the methods useful for method overloading?

976

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Why do we use cookie?

906

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What is the difference between require_once and require in php?

1017

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Can you define an array argument as a reference type?

876

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Suppose the variable $var1 is set to 10 and the $var2 is set to the character var1, what's the value of $$var2?

907

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what is variable scope, which variables are accessible from where and what are "undefined variable" errors?

997

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Explain some of the php string functions?

914

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What is difference between compile time and run time polymorphism?

955

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