如何循环、匹配和替换? [英] How to loop through, match and replace?
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问题描述
我有多个带有相同花括号的字符串,我想将它们替换为动态字符串,如果计数为 1,则需要替换第一次出现,如果计数为 2,则替换第二次出现,依此类推,直到条件满足.
I have multiple strings with same curly braces I want to replace them as dynamic if I get the count as 1 then need to replace the first occurrence, If count as 2 then replaces the second occurrence as so on until condition satisfies.
<?php
include_once("con.php");
$db = new Da();
$con = $db->con();
$String = "{{ONE}} {{TWO}} {{THREE}} {{FOUR}} {{FIVE}} {{SIX}}";
$Count = 1;
if(preg_match_all("/\{\{[^{}]+\}\}/", $lclString, $matches)) {
foreach ($matches[0] as $match) {
$Count++;
$Query = "SELECT link FROM student WHERE linkVal = '".$match."'";
$Result = $con->query($Query);
if($row = $Result->fetch(PDO::FETCH_ASSOC)) {
$NewValue = preg_replace("/\{\{[^{}]+\}\}/", $row["link"], $String);
}
}
echo json_encode($NewValue);
}
?>
如果第一次出现,{{ONE}} 应该用 $row["link"] 替换为新值,其次将 {{TWO}} 替换为新值,依此类推.
If first occurrence the {{ONE}} should replace with new value with $row["link"], Secondly replace {{TWO}} With New value so on.
推荐答案
在每次匹配的循环内,我建议您使用 str_replace
代替 preg_replace
:
Within the loop on each match, instead of using preg_replace
, I suggest you to use str_replace
:
if(preg_match_all("/\{\{[^{}]+\}\}/", $lclString, $matches)) {
$NewValue = $String;
foreach ($matches[0] as $match) {
$Count++;
$Query = "SELECT link FROM student WHERE linkVal = '".$match."'";
$Result = $con->query($Query);
if($row = $Result->fetch(PDO::FETCH_ASSOC)) {
$NewValue = str_replace($match, $row["link"], $NewValue);
// ^^^^^^^^^^^^^^^^^^
}
}
echo json_encode($NewValue);
}
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