CHDB_CREATE(3) 1 CHDB_CREATE(3)chdb_create - Creates a chdb fileSYNOPSIS
bool chdb_create (string $pathname, array $data)
DESCRIPTION chdb_create(3) creates a chdb file containing the specified key-value pairs.
Note
chdb files are not portable across little-endian and big-endian environments. Except for that, they are portable across different
architectures. Also compatibility across different versions of chdb is not guaranteed.
PARAMETERS
o $pathname
- The name of the file to create. If a file with the same name already exists, it is overwritten.
o $data
- An array containing the key-value pairs to store in the chdb file. Keys and values are converted to strings before being writ-
ten to the file, as chdb only support the string type. Note that binary strings are supported as well, both as keys and values.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
ERRORS /EXCEPTIONS
Throws an exception in case the chdb file hasn't been successfully created.
EXAMPLES
Example #1
chdb_create(3) example
<?php
$data = array(
'key1' => 'value1',
'key2' => 'value2',
// ...
);
chdb_create('data.chdb', $data);
?>
The above example will generate a chdb file named data.chdb and containing the key-value pairs defined in $data.
PHP Documentation Group CHDB_CREATE(3)
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ARRAY_KEY_EXISTS(3) 1 ARRAY_KEY_EXISTS(3)array_key_exists - Checks if the given key or index exists in the arraySYNOPSIS
bool array_key_exists (mixed $key, array $array)
DESCRIPTION array_key_exists(3) returns TRUE if the given $key is set in the array. $key can be any value possible for an array index.
PARAMETERS
o $key
- Value to check.
o $array
- An array with keys to check.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
array_key_exists(3) example
<?php
$search_array = array('first' => 1, 'second' => 4);
if (array_key_exists('first', $search_array)) {
echo "The 'first' element is in the array";
}
?>
Example #2
array_key_exists(3) vs isset(3)isset(3) does not return TRUE for array keys that correspond to a NULL value, while array_key_exists(3) does.
<?php
$search_array = array('first' => null, 'second' => 4);
// returns false
isset($search_array['first']);
// returns true
array_key_exists('first', $search_array);
?>
NOTES
Note
For backward compatibility, the following deprecated alias may be used: key_exists(3)
Note
For backward compatibility reasons, array_key_exists(3) will also return TRUE if $key is a property defined within an object given
as $array. This behaviour should not be relied upon, and care should be taken to ensure that $array is an array.
To check whether a property exists in an object, use property_exists(3).
SEE ALSO isset(3), array_keys(3), in_array(3), property_exists(3).
PHP Documentation Group ARRAY_KEY_EXISTS(3)
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