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<?php
/**
* This file is meant for very generic functions that should be allways available, PHP compatibility fixes and so on.
*
* Do not let it grow too much and make sure to wrap each function in !function_exists() condition.
*
* @since 2.0
*/
if( !function_exists( 'wpcf_getpost' ) ) {
/**
* Safely retrieve a key from $_POST variable.
*
* This is a wrapper for wpcf_getarr(). See that for more information.
*
* @param string $key
* @param mixed $default
* @param null|array $valid
*
* @return mixed
* @since 1.9
*/
function wpcf_getpost( $key, $default = '', $valid = null ) {
return wpcf_getarr( $_POST, $key, $default, $valid );
}
}
if( !function_exists( 'wpcf_getget' ) ) {
/**
* Safely retrieve a key from $_GET variable.
*
* This is a wrapper for wpcf_getarr(). See that for more information.
*
* @param string $key
* @param mixed $default
* @param null|array $valid
*
* @return mixed
* @since 1.9
*/
function wpcf_getget( $key, $default = '', $valid = null ) {
return wpcf_getarr( $_GET, $key, $default, $valid );
}
}
if( !function_exists( 'wpcf_getarr' ) ) {
/**
* Safely retrieve a key from given array (meant for $_POST, $_GET, etc).
*
* Checks if the key is set in the source array. If not, default value is returned. Optionally validates against array
* of allowed values and returns default value if the validation fails.
*
* @param array $source The source array.
* @param string|int $key The key to be retrieved from the source array.
* @param mixed $default Default value to be returned if key is not set or the value is invalid. Optional.
* Default is empty string.
* @param null|array $valid If an array is provided, the value will be validated against it's elements.
*
* @return mixed The value of the given key or $default.
*
* @since 1.9
*/
function wpcf_getarr( &$source, $key, $default = '', $valid = null ) {
if ( is_array( $source ) && array_key_exists( $key, $source ) ) {
$val = $source[ $key ];
if ( is_array( $valid ) && ! in_array( $val, $valid ) ) {
return $default;
}
return $val;
} else {
return $default;
}
}
}
if( !function_exists( 'wpcf_ensarr' ) ) {
/**
* Ensure that a variable is an array.
*
* @param mixed $array The original value.
* @param array $default Default value to use when no array is provided. This one should definitely be an array,
* otherwise the function doesn't make much sense.
*
* @return array The original array or a default value if no array is provided.
*
* @since 1.9
*/
function wpcf_ensarr( $array, $default = array() ) {
return ( is_array( $array ) ? $array : $default );
}
}
if( !function_exists( 'wpcf_wraparr' ) ) {
/**
* Wrap a variable value in an array if it's not array already.
*
* @param mixed $input
*
* @return array
* @since 1.9.1
*/
function wpcf_wraparr( $input ) {
return ( is_array( $input ) ? $input : array( $input ) );
}
}
if( !function_exists( 'wpcf_getnest' ) ) {
/**
* Get a value from nested associative array.
*
* This function will try to traverse a nested associative array by the set of keys provided.
*
* E.g. if you have $source = array( 'a' => array( 'b' => array( 'c' => 'my_value' ) ) ) and want to reach 'my_value',
* you need to write: $my_value = wpcf_getnest( $source, array( 'a', 'b', 'c' ) );
*
* @param mixed|array $source The source array.
* @param string[] $keys Keys which will be used to access the final value.
* @param null|mixed $default Default value to return when the keys cannot be followed.
*
* @return mixed|null Value in the nested structure defined by keys or default value.
*
* @since 1.9
*/
function wpcf_getnest( &$source, $keys = array(), $default = null ) {
$current_value = $source;
// For detecting if a value is missing in a sub-array, we'll use this temporary object.
// We cannot just use $default on every level of the nesting, because if $default is an
// (possibly nested) array itself, it might mess with the value retrieval in an unexpected way.
$missing_value = new stdClass();
while( ! empty( $keys ) ) {
$current_key = array_shift( $keys );
$is_last_key = empty( $keys );
$current_value = wpcf_getarr( $current_value, $current_key, $missing_value );
if ( $is_last_key ) {
// Apply given default value.
if( $missing_value === $current_value ) {
return $default;
} else {
return $current_value;
}
} elseif ( ! is_array( $current_value ) ) {
return $default;
}
}
return $default;
}
}