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Integers - The "is_int()" function can be used to check if a variable is has an integer for its value. ---- is_int($variable); // Returns true if $variable is an integer - otherwise false ---- Numeric Strings - Numeric strings are strings with numbers (or things that count as numbers) in them. Numeric-string variables are not integer variables. Numeric-string variables are passed on through forms, instead of integer variables - if you were wondering. Check form values using string formats, and not integer formats. The "is_numeric()" function can be used to check if a variable is a string with numbers - and only numbers - in it (except things that add up to be numbers). ---- is_numeric($variable); // Returns true if $variable is a string, and only contains numbers (broadly speaking) - false otherwise ---- Strings - String values are just text, basically. String variables can contain integers, but that does not make it an integer-type variable - it makes it a numeric string variable. The "is_string" function can be used to check if a variable contains the value of a string. ---- is_string($variable); // Returns true if $variable is a string - false otherwise
What else can I help you with?
In PHP you can use both single quotes ( ' ' ) and double quotes ( ) for strings?
You can use single quotes $variable = 'string'; You can use double quotes $variable = "string"; You can use the Heredoc method $variable = <<<EOT Very Long String EOT; And you can use the Nowdoc method (after PHP 5.3.0) $variable = <<<'EOT' Very Long String EOT;
How do you check the length of a string in PHP?
It is fairly simple to check the length of a string in PHP. All you need to do is use the function strlen(). Below is an example of how it is used. <?php $my_text = "Hello"; echo strlen($my_text); // outputs 5 ?>
How do you validate empty fields in PHP?
PHP provides a function called empty($var), which tests if $var is "empty." Empty has an odd definition, since the function returns true if the variable loosely equates to False. Although a zero-length string would be considered empty, so would the string "0" (among other irrelevant values).To accept the value "0" from a field, use strlen($var). It tests the length of any variable, after casting it to a string. If this function truly equals integer zero (compared with triple-equals), the variable must be empty.
Write a PHP program to check whether the string is palindrome or not?
You can do this: <?php if ( $word === strrev( $word ) ) { echo "The word is a palindrome"; } else { echo "The word is not a palindrome"; }
How to display a variable in PHP using echo or print statements?
displaying a variable in php using echo statement? <?php $name="ram"; //declaring and defining the variable echo "$name"; //printing the variable using echo command ?>
In PHP you can use both single quotes ( ' ' ) and double quotes ( ) for strings?
You can use single quotes $variable = 'string'; You can use double quotes $variable = "string"; You can use the Heredoc method $variable = <<<EOT Very Long String EOT; And you can use the Nowdoc method (after PHP 5.3.0) $variable = <<<'EOT' Very Long String EOT;
How can a PHP static be initialized?
PHP static can only be initialized using a literal or constant. You can not use an expression. You can initialize it to an integer but you may not to another variable.
How do you check the length of a string in PHP?
It is fairly simple to check the length of a string in PHP. All you need to do is use the function strlen(). Below is an example of how it is used. <?php $my_text = "Hello"; echo strlen($my_text); // outputs 5 ?>
How do you validate empty fields in PHP?
PHP provides a function called empty($var), which tests if $var is "empty." Empty has an odd definition, since the function returns true if the variable loosely equates to False. Although a zero-length string would be considered empty, so would the string "0" (among other irrelevant values).To accept the value "0" from a field, use strlen($var). It tests the length of any variable, after casting it to a string. If this function truly equals integer zero (compared with triple-equals), the variable must be empty.
Write a PHP program to check whether the string is palindrome or not?
You can do this: <?php if ( $word === strrev( $word ) ) { echo "The word is a palindrome"; } else { echo "The word is not a palindrome"; }
How do you define a constant in PHP?
You can define a constant using the define() directive.you can use this a number of ways;to define a variable to a constant do:$string = "hello";define("string",$string);to define a string to a constant use:define("hello","there");to define a integer or other numerical value use:define("number",1.0);Summery:to define a string use quotes as you would do a string.Unlike variables in PHP a constant cannot be changed or undefined once it is defined. Constant remains automatically globally throughout the script. It means that it can be accessed from inside a function. e.g.
What is a typeless variable?
A typeless variable is one which is not bound to a specific data type. This variable can contain a string, then be assigned an integer, then an array, then an object, etc. Note that some programming languages, like the C languages, do not offer typeless variables.An example of PHP typeless variables in action:
How to display a variable in PHP using echo or print statements?
displaying a variable in php using echo statement? <?php $name="ram"; //declaring and defining the variable echo "$name"; //printing the variable using echo command ?>
What is integers in php variable?
An integer is a whole number, sometimes referred to as a "counting number." For instance, the number 5 is an integer. As is 19 and -2289. 0 is an integer.Integers do not have a fractional part. In PHP, those numbers are called floats. So 1.4, -34.873, and PI are all floats.Because PHP is weakly typed, there's not as much concern as in other languages. If you try an do something mathematically to a number you declared as an integer that requires it to be a float, PHP almost always makes the implicit conversion between the two types. The same goes for when you try to print and integer of a float on the screen: PHP will convert them into strings without your having to lift a finger.
What is the text move function in PHP?
"Text move" isn't very clear. If you want to assign strings to different variables, use the assignment operator: <?php $old_var = 'blah'; $new_var = $old_var; echo $new_var; // Displays "blah" ?> If you want to work with a certain part of a string, use substr(): <?php $part_of_string = substr($string, $start, $length); // $start should be an integer, indicating which character to start obtaining the string at // $length should be an integer, indicating how many characters you want to obtain. echo = substr('somesimplestring', 5, 6); // Displays "simple" ?>
How do you remove whitespaces from a string in PHP?
<?php trim(ereg_replace( ' +', ' ', $extraWhiteSpace)); ?>
What is var char in php?
Varchar in SQL means string in PHP.
