在特定字符位置之前搜索字符串中的值。 [PHP]

Search for value in string before a certain character position. [PHP]

我正在制作一个显示备份信息的网站。

我遇到的障碍是我需要在某个字符位置之前获取信息。

字符串看起来像:

数据 1 => 2019-06-30-08-00-00 , 2019-07-30-08-00-00 , 2019-08-30-08-00-00 数据 2 => 2019-06- 30-08-30-00 , 2019-07-30-08-30-00 , 2019-08-30-08-30-00

我从字符串中获取所有搜索信息的代码。

$BackupJob_list = $BackupJob_list['Data'];
$BackupJob_list = json_encode($BackupJob_list);

$string = "$BackupJob_list"; //String where I need the info from
$needle = "2019-08-30"; //The search value
$lastPos = 0; //Starting position
$positions = array();

//Get lastPos and go again...
while (($lastPos = strpos($string, $needle, $lastPos))!== false) {
    $positions[] = $lastPos;
    $lastPos = $lastPos + strlen($needle);
}

//Echo every value that is found in the string.
foreach ($positions as $value) {
    echo substr($BackupJob_list, $value, 19)."<br/>";
}

我想得到的是:

2019-06-30-08-00-00

现在我得到了

2019-06-30-08-00-00

2019-06-30-08-30-00

您可以使用 strpos (doc) 检查为:

$str = "2019-06-30-08-00-00,2019-07-30-08-00-00,2019-08-30-08-00-00";
$needle = "2019-08-30";
$arr = explode(",", $str); // convert string to array
foreach($arr as $e) {
    if (strpos($e, $needle) === 0) echo "Found! Here: $e \n";
}