61⟩ Tell me what does the PHP error ‘Parse error in PHP – unexpected T_variable at line x’ means?
This is a PHP syntax error expressing that a mistake at the line x stops parsing and executing the program.
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161 Junior PHP Developer Questions And Answers
62⟩ Tell me how a constant is defined in a PHP script?
The define() directive lets us defining a constant as follows:
define (“ACONSTANT”, 123);
63⟩ Explain me differences between GET and POST methods?
We can send 1024 bytes using GET method but POST method can transfer large amount of data and POST is the secure method than GET method.
64⟩ Write a program using while loop in PHP?
$my_qry = mysql_query("SELECT * FROM `users` WHERE `u_id`='1'; ");
while($result = mysql_fetch_array($my_qry))
{
echo $result['First_name'.]."
";
}
65⟩ Tell me what is the default session time in php?
The default session time in php is until closing of browser
66⟩ Tell me what is the difference between characters 34 and x34?
34 is octal 34 and x34 is hex 34.
67⟩ Tell me what is the difference between the functions strstr() and stristr()?
The string function strstr(string allString, string occ) returns part of allString from the first occurrence of occ to the end of allString. This function is case-sensitive. stristr() is identical to strstr() except that it is case insensitive.
68⟩ Explain how we can retrieve the data in the result set of MySQL using PHP?
☛ 1. mysql_fetch_row
☛ 2. mysql_fetch_array
☛ 3. mysql_fetch_object
☛ 4. mysql_fetch_assoc
69⟩ Object-Oriented Methodology in PHP?
Object orientation is a software/Web development methodology that is based on the modeling a real world system.An object is the core concept involved in the object orientation. An object is the copy of the real world entity. An object oriented model is a collection of objects and its inter-relationships
70⟩ Explain how to run the interactive PHP shell from the command line interface?
Just use the PHP CLI program with the option -a as follows:
php -a
71⟩ Explain me how failures in execution are handled with include() and require() functions?
If the function require() cannot access to the file then it ends with a fatal error. However, the include() function gives a warning and the PHP script continues to execute.
72⟩ Explain what does the unlink() function means?
The unlink() function is dedicated for file system handling. It simply deletes the file given as entry.
73⟩ Tell me what does accessing a class via means?
:: is used to access static methods that do not require object initialization.
74⟩ Tell me how can we get the error when there is a problem to upload a file?
$_FILES[‘userfile’][‘error’] contains the error code associated with the uploaded file.
75⟩ Tell me how can we determine whether a variable is set?
The boolean function isset determines if a variable is set and is not NULL.
76⟩ Explain what are the three classes of errors that can occur in PHP?
The three basic classes of errors are notices (non-critical), warnings (serious errors) and fatal errors (critical errors).
77⟩ Explain me is it possible to destroy a cookie?
Yes, it is possible by setting the cookie with a past expiration time.
78⟩ Do you know what is the differences between $a != $b and $a !== $b?
!= means inequality (TRUE if $a is not equal to $b) and !== means non-identity (TRUE if $a is not identical to $b).
79⟩ Do you know when sessions ends?
Sessions automatically ends when the PHP script finishs executing, but can be manually ended using the session_write_close().
80⟩ Tell me how can we define a variable accessible in functions of a PHP script?
This feature is possible using the global keyword.
