PHP Resources

These are PHP built in functions
array_reverse() This function reverses the order of elements in an array.
array_values() This function returns all the values from an array and auto eliminate the previous keys and reassign index starting from 0.
array_diff() This function is used to get array differences. This function returns those values from the first array that are not present in other arrays.
array_key_exists() This function is used to check the existence of the given array index in the array.
array_map() This function is used to apply a callback function on each element of an array.
array_push() This function is used to push one or more elements to the end of an array.
array_search() This function searches a value in an array and returns its key.
array_unique() This function removes the duplicate values from the array.
array_unshift() This function inserts new array elements at the beginning of an array. We can insert one or more elements in the array.
ceil() Ceil function is used to round float value to the nearest integer value.
chr() This function returns character from the ASCII value.
class_exists() This function is used to check whether the class name is exist or not.
copy() This function is used to copy a file. It returns a boolean value.
count() This function returns total number of elements in an array.
curl_setopt() curl_setopt is used to set option for a cURL transfer. It returns a boolean value.
define() This is used to define a named constant.
defined() This function is used to check the existence of a constant. It returns a boolean value.
delete() This is used to delete a file.
die() This is used to display a message and exists from the current script.
dirname() This is used to get the parent directory name of the given directory. It returns the directory name one above the current given directory.
each() This is used to return the current key value pair of an array.
empty() This function is used to check whether the variable is empty or not. If a variable does not exist, then it is considered to be empty.
end() This function is used to return the last element of an array.
error_reporting() This is used to report the errors. This return the errors of script at the run time based on the given error type.
exit() This returns the specified message, error code and terminates the script.
explode() This function is used to split a string into multiple strings based on the specified delimiter.
exp() This is a mathematical function used to calculate exponent.
fclose() This function is used in file handling, to close the open file.
file_exists() This function is used to check whether a file or directory exists or not.
fread() This function is used to read an open file.
function_exists() This function is used to check the existence of a function.
get_class() This function is used to get the class name of the given object.
get_current_user() This function is used to get the owner of the current file.
getdate() This function is used to get current date and time information.
getenv() This function is used to get the value of an environment variable.
hash() This function is used to convert data in hash form.
header() This function is used to redirect a page to a different url, to set the content type.
implode() This function is used to convert array elements into string.
in_array() This function is used to check the existence of a value in an array or not.
is_bool() This function is used to check whether the variable datatype is boolean or not.
is_file() This function is used to check the existence of a file.
is_null() This function is used to check whether a variable is null or not.
is_readable() This function is used to check whether a file exist and readable or not.
isset() This function is used to check whether a variable is set with a value or null.
key() This function returns element at the key position.
ksort() This function is used to sort the array elements in ascending order by keys.
md5() This function is used to generate hash value of a string.
method_exists() This function is used to check the existence of a method in a given object.
mkdir() This function is used to create directory at the specified path or location.
mt_rand() This function is used to return a random number. This is faster than the rand function.
next() This function is used to get the value at the next array pointer from the given location.
number_format() This function is used to format the number values.
ob_end_clean() This function is used to destroy the output buffer.
ob_get_contents() This function is used to return the content of the output buffer. This is used before buffer clean and after output start.
ob_start() This function is used to start output buffering. When this is turned on, instead of sending the data, it stores in the internal storage.
parse_url() This function is used to parse the url and returns the associative array.
rand() This function is used to generate the random number. You can also set the specific range to generate the number.
sort() This function is used to sort the array elements in ascending order.
split() This is used to divide the string from the given pattern into elements that form an array.
str_repeat() This function is used to repeat the string, a given number of times.
strlen() This function is used to get the length of a given string.
strtolower() This function is used to convert all string characters to lowercase.
strtoupper() This function is used to convert all string characters to uppercase.
substr() This is used to return a substring from a string from the specified position.






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