如何使用PHP从字符串中删除一些字符

我需要使用PHP从字符串按值搜索中删除一些字符。我在下面解释我的代码

当前数据

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57 AM"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57 PM"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57 PM"
    )
);

预期产出

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57"
    )
);

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57 AM"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57 PM"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57 PM"
    )
);

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57"
    )
);

从上面的数组中有一个

date

字段值，我需要使用PHP从所有日期中删除

AM/PM

$datArr=array(array("name"=>"Ram","id"=>1,"date"=>"12/04/2017 05:31:57 AM"),array("name"=>"Rahim","id"=>5,"date"=>"12/03/2017 12:31:57 PM"),array("name"=>"Raj","id"=>4,"date"=>"12/04/2017 05:31:57 PM"));

使用foreach循环遍历数组。 对于日期值，请执行以下操作

将日期字符串转换为datetime对象

$time = strtotime($dateKeyValueInArray);

现在设置此时间戳的日期格式

$newformat = date('Y-m-d',$time);

通过使用查看输出

echo $newformat;

参考链接是

---

希望它有帮助：）

您可以通过

str\u replace（）

在

foreach

循环上完成它

代码

foreach ($datArr as &$dat) {
    $dat['date'] = str_replace([' AM', ' PM'], "", $dat['date']);
}

输入

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57"
    )
);

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57 AM"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57 PM"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57 PM"
    )
);

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57"
    )
);

输出

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57"
    )
);

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57 AM"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57 PM"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57 PM"
    )
);

$datArr = array(
    array(
        "name" => "Ram",
        "id" => 1,
        "date" => "12/04/2017 05:31:57"
    ),
    array(
        "name" => "Rahim",
        "id" => 5,
        "date" => "12/03/2017 12:31:57"
    ),
    array(
        "name" => "Raj",
        "id" => 4,
        "date" => "12/04/2017 05:31:57"
    )
);

---

请尝试此操作的foreach循环

$datArr=array(array("name"=>"Ram","id"=>1,"date"=>"12/04/2017 05:31:57 AM"),array("name"=>"Rahim","id"=>5,"date"=>"12/03/2017 12:31:57 PM"),array("name"=>"Raj","id"=>4,"date"=>"12/04/2017 05:31:57 PM"));

print_r($datArr);
foreach($datArr as $key=>$value)
{
    $datArr[$key]['date'] = date('m/d/Y H:i:s',strtotime($value['date']));
}

echo "after";
print_r($datArr);

此代码的输出

    Array
(
    [0] => Array
        (
            [name] => Ram
            [id] => 1
            [date] => 12/04/2017 05:31:57 AM
        )

    [1] => Array
        (
            [name] => Rahim
            [id] => 5
            [date] => 12/03/2017 12:31:57 PM
        )

    [2] => Array
        (
            [name] => Raj
            [id] => 4
            [date] => 12/04/2017 05:31:57 PM
        )

)
afterArray
(
    [0] => Array
        (
            [name] => Ram
            [id] => 1
            [date] => 12/04/2017 05:31:57
        )

    [1] => Array
        (
            [name] => Rahim
            [id] => 5
            [date] => 12/03/2017 12:31:57
        )

    [2] => Array
        (
            [name] => Raj
            [id] => 4
            [date] => 12/04/2017 17:31:57
        )

)

---

试试这个。这是一个简单易懂的例子

substr

函数用于从

0

开始到

length-2

提取字符串的一部分，以排除

AM/PM

foreach($datArr as $key => $value){
    $datArr[$key]['date'] = substr($value['date'], 0, strlen($value['date'])-2);
}
print_r($datArr); 

---

快乐编码：-）

使用rtrim去除尾砂，如下所示

$datArr = array_map(function($v){
    $v['date'] = rtrim($v['date'], " APMapm");
    return $v;
}, $datArr);

---

您可以使用正则表达式通过循环删除不需要的单词

foreach($datArr as &$i)
{
     $i['date']=preg_replace('[AM|PM]',"",$i['date']);
}
print_r ($datArr);

输出

---

我想说一下我的文章，如果你直接使用字符串函数删除AM/PM，我想你可能会有错误的日期时间。如果你这样做，你将如何区分上午5点到下午5点？现在你会得到错误的数据

如果你要在5点后取出PM，那么你需要将其格式化为军事时间（17）。要做到这一点，您需要先转换每次。您可以使用

DateTime

：

---

为什么，只要在输出它时执行，或者在创建它时不要将它放在那里。尝试foreach循环检查键名'date'，并从值中删除不需要的部分。我这样做是

foreach（$datArr as$key=>$value）{/*if（preg_match（'（am | PM），$value['date']）==1{$datArr[$key]['date']=str replace（'search'，replace，subject）；}*/if（strpos（'value['date']，'AM'）==true）{$datArr[$key]['date']=str_replace（'AM'，''.$value['date']）；}if（strpos（'value['date']，'PM'）==true）{echo'PM br>'.$datArr key['date']=str replace（'PM'，'value['date']）；}

。但它并没有按预期给出输出。@subhra您可以通过将要替换的内容数组传递给

str_replace（）通过一条语句来实现这一点

。查看我的答案了解更多信息。使用字符串函数是否危险？如果删除它们，现在如何区分下午5点和上午5点？如果要删除上午5点和上午5点，是否也应该转换为军事时间PM@kris-这是一个很好的解决方案，你能解释一下APMapm的工作原理吗，谢谢。它列出了要删除的所有字符。您可以参考php手册