String functions in PHP
Substr() function - Gets part of a string
string substr(string, start[, length]);
Example:
echo substr('Hello World!', 5, 5); // Output : "World"
strlen() - Length of a string
strlen(stringname);
Example:
strlen("Mica Jovic"); Output : 10
Example:
$i = 10;
if (is_integer($i))
{
echo("$i is an integer");
}
if (is_string($i))
{
echo("$i is a string");
}
if (is_double($i))
{
echo("$i is a double");
}
Trim(), ltrim() and rtrim() function
trim() - Removes all whitespace characters from both the left and right ends of a string.
ltrim() - Removes all whitespace characters from left end of string
rtrim() - Removes all whitespace characters from right ends of a string.
whitespace characters: space, null, newline, tab, carriage return!
Example:
$strText = " Hello World ";
$strNew = trim($strText); // Output : "Hello World"
$strNew = ltrim($strText); // Output : "Hello World "
$strNew = rtrim($strText); // Output : " Hello World"
explode() - Splitting a string into an array
explode(separator,stringname);
Example:
$string="11-03-2007"
$newArray = explode("-",$string);
echo $newArray[0] Output : 11
echo $newArray[1] Output : 03
echo $newArray[2] Output : 2007
join() or implode() - Joining the array elements into a single string
join(separator,arrayname);
(Or)
implode(separator,arrayname);
Example:
$oldArray=array("03","02","2007");
implode("/",$oldArray); Output : 03/02/2007
str_repeat() - Repeatting a string 'n' times
str_repeat($string,integervalue);
Example:
str_repeat("122",3); Output : 123123123
strip_tags() - Remove HTML tags from the string
strip_tags($string, [allowable tags]);
Example:
strip_tags("<i>Hello World</i> <br> <b>Hello World</b>","<br>");
// Output : "Hello World Hello<br> World<br>"
str_replace() function — Find and replace part of the string
str_replace(find, replace, string);
Example:
echo str_replace(".", "!", "Hello World!"); // Output : "Hello World."
checkdate() - Check the date format
checkdate ($intMonth,$date, $intYear);
1. checkdate (1, 30,2007); Output: (1 means true)
2. checkdate (2, 30,2007); Output: (null means false)