PHP more useful functions

PHP strlen() Function

The strlen() function returns the length of a string.

Syntax

strlen(string)

Example

<?php
echo strlen("Hello world!");
?>

PHP substr() Function

Return part of a string

The substr() function returns a part of a string.

Syntax

substr(string,start,length)

Parameter	Description
string	Required. Specifies the string to return a part of
start	Required. Specifies where to start in the string A positive number - Start at a specified position in the string A negative number - Start at a specified position from the end of the string 0 - Start at the first character in string
length	Optional. Specifies the length of the returned string. Default is to the end of the string. A positive number - The length to be returned from the start parameter Negative number - The length to be returned from the end of the string

Get first n characters of a string

Examples

echo substr("Hello world",0,4);
Output is print  "Hello"


$category_name=substr($cat['description'],3,  strlen($cat['description'])-1);

PHP fmod() Function

The fmod() function returns the remainder (modulo) of x/y.

Syntax

fmod(x,y);

             if(fmod($i, 2)==0){                  

                  //  Reminder is zero.
             
            }
            else{

                //  Reminder is one.

            }

Converting separate month, day and year values into a timestamp

using setDate funtion

<?php
$date = new DateTime();
$date->setDate(2001, 2, 3);
echo $date->format('Y-m-d');
?>