PHP CMap::find方法代碼示例

 /**
  * Determines if a time zone name is a known one.
  *
  * The method also searches among the backward compatible names.
  *
  * @param  string $name The time zone name to be looked for (case-sensitive).
  *
  * @return bool `true` if the name is known, `false` otherwise.
  */
 public static function isNameKnown($name)
 {
     assert('is_cstring($name)', vs(isset($this), get_defined_vars()));
     $knownNamesWithBc = DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC);
     return CMap::find($knownNamesWithBc, $name) && self::isNameIcuCompatible($name);
 }

 /**
  * Determines if a map contains a specified value.
  *
  * You can use your own comparator for the search, but the default comparator has got you covered when searching
  * for scalar values, such as `string`, `int`, `float`, and `bool`. And the default comparator is smart enough to
  * know how to compare objects of those classes that conform to the IEquality or IEqualityAndOrder interface
  * (static or not), including CUStringObject, CArrayObject, CMapObject, CTime etc. See the
  * [CComparator](CComparator.html) class for more on this.
  *
  * @param  mixed $whatValue The searched value.
  * @param  callable $comparator **OPTIONAL. Default is** `CComparator::EQUALITY`. The function or method to be
  * used for the comparison of values while searching. If this parameter is provided, the comparator should take two
  * parameters, with the first parameter being a value from the map and the second parameter being the searched
  * value, and return `true` if the two values are equal and `false` otherwise.
  * @param  reference $foundUnderKey **OPTIONAL. OUTPUT.** If a value has been found after the method was called
  * with this parameter provided, the parameter's value is being the first key under which the value was seen. If
  * the key is a string, its output type is `CUStringObject`.
  *
  * @return bool `true` if such value was found in the map, `false` otherwise.
  *
  * @link   CComparator.html CComparator
  */
 public function find($whatValue, $comparator = CComparator::EQUALITY, &$foundUnderKey = null)
 {
     $found = CMap::find($this->m_map, $whatValue, $comparator, $foundUnderKey);
     return $found;
 }

 public function testFind()
 {
     $map = ["one" => "a", "two" => "b", "three" => "c", "four" => "d", "five" => "e"];
     // Using the default comparator.
     $found = CMap::find($map, "c");
     $this->assertTrue($found);
     $foundUnderKey;
     $found = CMap::find($map, "d", CComparator::EQUALITY, $foundUnderKey);
     $this->assertTrue($found);
     $this->assertTrue($foundUnderKey === "four");
     $found = CMap::find($map, "C");
     $this->assertFalse($found);
     $found = CMap::find($map, "f");
     $this->assertFalse($found);
     // Using a custom comparator.
     $comparator = function ($string0, $string1) {
         return CString::toLowerCase($string0) === CString::toLowerCase($string1);
     };
     $foundUnderKey;
     $found = CMap::find($map, "C", $comparator, $foundUnderKey);
     $this->assertTrue($found);
     $this->assertTrue($foundUnderKey === "three");
     // Special case.
     $map = CMap::make();
     $found = CMap::find($map, "a");
     $this->assertFalse($found);
 }