PHP Interview Questions

require(): displays error and stops the execution.
whereas, include gives a warning and continues the execution.

require() includes and evaluates a specific file, while require_once() does that only if it has not been included before (on the same page).

PHP is a loosely typed language.

Because variables data type can be vary, :)

Code
$string = RAVINDRA;
$i = 0;
while(isset($string[$i])){
        $i++;
}
$i--;
while(isset($string[$i])){
        echo $string[$i];
$i--;
}
 

<?php
$str_name='Sachin Tendulkar';
$len=strlen($str_name);
//echo $len;
$i=$len;
for ($i;$i>-1;$i--)   
//$i>-1 because in array Ist element is start with 0th position.
{
echo $str_name[$i];
}
?>

For uploading videos you need not store the video in database. Just you store the video path in database. You store the videos in a separate folder like video_uploads. After uploading you can call tho...

For uploading videos you need not store the video in database. Just you store the video path in database. You store the videos in a separate folder like video_uploads. After uploading you can call...

Code
<?php
echo '<pre>';
print_r($_REQUEST);
echo '</pre>';
 

Code
<?php
echo "Post data: ";
foreach ($_GET as $key => $value)
{
print_r($key , $value);
}
?>

1. both are using to display the value.
2. echo is faster than print
3. echo displays multiple statements and variables but print only
4. print is function it returns a value.

echo:- print:- a)can accept multiple parameters. a)cant accept multiple parameters. b)doesnt return any value. b)slower than echo...

The better way is store the sessions server side on database or, if you need high performance loosing scalability, on RAM.

Session values are normally stored on a cookie file.Default cookie file is PHPSESID.This cookie file is stored on a client system.

By using mysql_real_escape_string()...

you can also use

Code
htmlspecialchars($string,ENT_QUOTES) 
 

Yes

By default, yes.

By using setcookie() function...

Single quote for performance reason, except that there are variables inside.

double quotation

$_SERVER[HTTP_USER_AGENT]; by this method we can know the properties of browser.

Code
echo $_SERVER['HTTP_USER_AGENT'] . " 
";

You don't need AJAX to perform this action, it can be done without using AJAX by onChange() function.

Try
divId.innerHTML=XMLhttp.responseText
if you want the whole form the whole form has to be posted and urlencoded etc. Just echo back the parts you acctually want with the values you want?

yes we can submit without submit button using java script or one more thing is make a location header.. like....

Code
Header("Location: $a");

add the following code at your page where you have form named as frmdemo.

function submitForm()
{
document.frmdemo.action=backpage.php;document.frmdemo.submit();
}
</script>
<a href="javascript:submitForm();" >Click here to submit the page

Post execute faster than get method. Get is default super global.

Both Are Types of Super Global Array Both Method is Performing same operation while execution but little difference listed below :: GET :: [1] GET is not Secure for Sensitive Data because Our will...

explode convert string to array. for exmaple.

Code
<?php
$x="anil,mukesh,neeraj";
if(is_string($x))
{
$y=explode(",",$x);
//"," is an identifier.
print-r $y;
}
?>

explode function is used to convert string into array & split is used to return an array

Yes, this can be done easily by using jQuery

1. Use Image for displaying Percentage Bar.

2. Change width of Image depending on Processing completed.

"php $iname=$_FILES['img1']['name']; $fp=fopen($_FILES['img1']['tmp_name'],r); $con=fread($fp,filesize($_FILES['img1']['tmp_name'])); mysql_connect("localh...

$iname=$_FILES['img1']['name'];    $fp=fopen($_FILES['img1']['tmp_name'],r);    $con=fread($fp,filesize($_FILES['img1']['tmp_n...

fsockopen() returns a file pointer which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()). If the call fails, it will return FALSE.

So feof can be used with a file open by fsockopen

fsockopen() returns a file pointer which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()). If the call fails, it will return FALSE.


So feof can be used with a file open by fsockopen

For this we can use the session objec($_SESSION)t. When the user login with his/ her user name and password, usually we check those to ensure for correctness. If that user name and password are valid ...

We can use session for that when user logged in with the help of session we can check weather he has logged or not.