我的数组中有一些来自用户的空字符串元素。在执行以下操作后,$linksArray
仍然具有空元素:
foreach($linksArray as $link)
{
if($link == '')
{
unset($link);
}
}
print_r($linksArray);
empty()
函数也不起作用。
我的数组中有一些来自用户的空字符串元素。在执行以下操作后,$linksArray
仍然具有空元素:
foreach($linksArray as $link)
{
if($link == '')
{
unset($link);
}
}
print_r($linksArray);
empty()
函数也不起作用。
$array_without_empty_values = array_filter($array);
foreach($linksArray as $link){
if(!empty($link)){
$new_arr[] = $link
}
}
print_r($new_arr);
使用array_filter
函数来删除空值:
$linksArray = array_filter($linksArray);
print_r($linksArray);
删除空数组元素
function removeEmptyElements(&$element)
{
if (is_array($element)) {
if ($key = key($element)) {
$element[$key] = array_filter($element);
}
if (count($element) != count($element, COUNT_RECURSIVE)) {
$element = array_filter(current($element), __FUNCTION__);
}
return $element;
} else {
return empty($element) ? false : $element;
}
}
$data = array(
'horarios' => array(),
'grupos' => array(
'1A' => array(
'Juan' => array(
'calificaciones' => array(
'Matematicas' => 8,
'Español' => 5,
'Ingles' => 9,
),
'asistencias' => array(
'enero' => 20,
'febrero' => 10,
'marzo' => '',
)
),
'Damian' => array(
'calificaciones' => array(
'Matematicas' => 10,
'Español' => '',
'Ingles' => 9,
),
'asistencias' => array(
'enero' => 20,
'febrero' => '',
'marzo' => 5,
)
),
),
'1B' => array(
'Mariana' => array(
'calificaciones' => array(
'Matematicas' => null,
'Español' => 7,
'Ingles' => 9,
),
'asistencias' => array(
'enero' => null,
'febrero' => 5,
'marzo' => 5,
)
),
),
)
);
$data = array_filter($data, 'removeEmptyElements');
var_dump($data);
¡它工作了!
我认为在这里使用array_walk更加合适
$linksArray = array('name', ' ', ' 342', '0', 0.0, null, '', false);
array_walk($linksArray, function(&$v, $k) use (&$linksArray){
$v = trim($v);
if ($v == '')
unset($linksArray[$k]);
});
print_r($linksArray);
Array
(
[0] => name
[2] => 342
[3] => 0
[4] => 0
)
我们确保即使用户添加了多个空格,空值也会被删除
我们还从有效值中去除了空格
最后,只有(null)、(布尔值False)和('')将被视为空字符串
至于False
,可以将其删除,因为据我所知用户无法提交布尔值。
array_filter()
的行为所困扰。例如,我之所以来到这个问题是因为我忘记了 array_filter()
是否会删除 NULL
。我浪费了时间,当我可以使用下面的解决方案并得到我的答案。array_filter
这样的 php 函数在没有传递回调时的行为。array_filter()
,因为我只是传递了一个自定义回调函数 - 如果你想的话,你可以将其提取出来成为自己的函数。我只是把它作为 foreach
循环的糖果来使用。<?php
$xs = [0, 1, 2, 3, "0", "", false, null];
$xs = array_filter($xs, function($x) {
if ($x === null) { return false; }
if ($x === false) { return false; }
if ($x === "") { return false; }
if ($x === "0") { return false; }
return true;
});
$xs = array_values($xs); // reindex array
echo "<pre>";
var_export($xs);
<?php
/**
* @param string $valueToFilter
*
* @return \Closure A function that expects a 1d array and returns an array
* filtered of values matching $valueToFilter.
*/
function filterValue($valueToFilter)
{
return function($xs) use ($valueToFilter) {
return array_filter($xs, function($x) use ($valueToFilter) {
return $x !== $valueToFilter;
});
};
}
// partially applied functions that each expect a 1d array of values
$filterNull = filterValue(null);
$filterFalse = filterValue(false);
$filterZeroString = filterValue("0");
$filterEmptyString = filterValue("");
$xs = [0, 1, 2, 3, null, false, "0", ""];
$xs = $filterNull($xs); //=> [0, 1, 2, 3, false, "0", ""]
$xs = $filterFalse($xs); //=> [0, 1, 2, 3, "0", ""]
$xs = $filterZeroString($xs); //=> [0, 1, 2, 3, ""]
$xs = $filterEmptyString($xs); //=> [0, 1, 2, 3]
echo "<pre>";
var_export($xs); //=> [0, 1, 2, 3]
pipe()
动态创建一个名为filterer()
的函数,它将为您应用这些部分应用的函数。<?php
/**
* Supply between 1..n functions each with an arity of 1 (that is, accepts
* one and only one argument). Versions prior to php 5.6 do not have the
* variadic operator `...` and as such require the use of `func_get_args()` to
* obtain the comma-delimited list of expressions provided via the argument
* list on function call.
*
* Example - Call the function `pipe()` like:
*
* pipe ($addOne, $multiplyByTwo);
*
* @return closure
*/
function pipe()
{
$functions = func_get_args(); // an array of callable functions [$addOne, $multiplyByTwo]
return function ($initialAccumulator) use ($functions) { // return a function with an arity of 1
return array_reduce( // chain the supplied `$arg` value through each function in the list of functions
$functions, // an array of functions to reduce over the supplied `$arg` value
function ($accumulator, $currFn) { // the reducer (a reducing function)
return $currFn($accumulator);
},
$initialAccumulator
);
};
}
/**
* @param string $valueToFilter
*
* @return \Closure A function that expects a 1d array and returns an array
* filtered of values matching $valueToFilter.
*/
function filterValue($valueToFilter)
{
return function($xs) use ($valueToFilter) {
return array_filter($xs, function($x) use ($valueToFilter) {
return $x !== $valueToFilter;
});
};
}
$filterer = pipe(
filterValue(null),
filterValue(false),
filterValue("0"),
filterValue("")
);
$xs = [0, 1, 2, 3, null, false, "0", ""];
$xs = $filterer($xs);
echo "<pre>";
var_export($xs); //=> [0, 1, 2, 3]
试试这个 ** 示例
$or = array(
'PersonalInformation.first_name' => $this->request->data['User']['first_name'],
'PersonalInformation.last_name' => $this->request->data['User']['last_name'],
'PersonalInformation.primary_phone' => $this->request->data['User']['primary_phone'],
'PersonalInformation.dob' => $this->request->data['User']['dob'],
'User.email' => $this->request->data['User']['email'],
);
$or = array_filter($or);
$condition = array(
'User.role' => array('U', 'P'),
'User.user_status' => array('active', 'lead', 'inactive'),
'OR' => $or
);