41⟩ Tell me how to find the length of a string?
strlen() function used to find the length of a string
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161 Junior PHP Developer Questions And Answers
42⟩ How send email in php?
To send email using PHP, you use the mail() function. This mail() function accepts 5 parameters as follows (the last 2 are optional). You need webserver, you can't send email from localhost. eg : mail($to,$subject,$message,$headers);
43⟩ Tell me how to find the position of the first occurrence of a substring in a string?
strpos() is used to find the position of the first occurrence of a substring in a string
44⟩ Do you know how can PHP and HTML interact?
It is possible to generate HTML through PHP scripts, and it is possible to pass informations from HTML to PHP.
45⟩ Do you know how can we check the value of a given variable is a number?
It is possible to use the dedicated function, is_numeric() to check whether it is a number or not.
46⟩ What is the most convenient hashing method to be used to hash passwords?
It is preferable to use crypt() which natively supports several hashing algorithms or the function hash() which supports more variants than crypt() rather than using the common hashing algorithms such as md5, sha1 or sha256 because they are conceived to be fast. hence, hashing passwords with these algorithms can vulnerability.
47⟩ Tell me what is the definition of a session?
A session is a logical object enabling us to preserve temporary data across multiple PHP pages.
48⟩ Tell us what does $_COOKIE means?
$_COOKIE is an associative array of variables sent to the current PHP script using the HTTP Cookies.
49⟩ Explain me what is the goto statement useful for?
The goto statement can be placed to enable jumping inside the PHP program. The target is pointed by a label followed by a colon, and the instruction is specified as a goto statement followed by the desired target label.
50⟩ Tell me how can we determine whether a PHP variable is an instantiated object of a certain class?
To be able to verify whether a PHP variable is an instantiated object of a certain class we use instanceof.
51⟩ Tell me how is it possible to parse a configuration file?
The function parse_ini_file() enables us to load in the ini file specified in filename, and returns the settings in it in an associative array.
52⟩ Explain me what is the difference between $_FILES[‘userfile’][‘name’] and $_FILES[‘userfile’][‘tmp_name’]?
$_FILES[‘userfile’][‘name’] represents the original name of the file on the client machine,
$_FILES[‘userfile’][‘tmp_name’] represents the temporary filename of the file stored on the server.
53⟩ Do you know what’s the difference between __sleep and __wakeup?
__sleep returns the array of all the variables that need to be saved, while __wakeup retrieves them.
54⟩ Explain what does the function get_magic_quotes_gpc() means?
The function get_magic_quotes_gpc() tells us whether the magic quotes is switched on or no.
55⟩ Tell me what is the main difference between require() and require_once()?
require() and require_once() perform the same task except that the second function checks if the PHP script is already included or not before executing it.
(same for include_once() and include())
56⟩ Explain difference between urlencode and urldecode?
This method is best when encode a string to used in a query part of a url. it returns a string in which all non-alphanumeric characters except -_. have replece with a percentege(%) sign . the urldecode->Decodes url to encode string as any %and other symbole are decode by the use of the urldecode() function.
57⟩ Tell me how to set a page as a home page in a php based site?
index.php is the default name of the home page in php based sites
58⟩ Tell me what's the difference between include and require?
It's how they handle failures. If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.
59⟩ Explain me the difference between include and require?
If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.
60⟩ Explain me what is the difference between explode() and split() functions?
Split function splits string into array by regular expression. Explode splits a string into array by string.
