Question

使用数组时，我遇到了PHP函数str_replace的麻烦。

我有这样的信息：

$message = strtolower("L rzzo rwldd ty esp mtdsza'd szdepw ty esp opgtw'd dple");

我正试图像这样使用str_replace：

$new_message = str_replace(
    array('l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','a','b','c','d','e','f','g','h','i','j','k'),
    array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'),
    $message);

结果应该是A good glass in the bishop's hostel in the devil's seat，而是p voos vlpss xn twt qxswop's wosttl xn twt stvxl's stpt。

但是，当我只尝试更换2个字母时，它会很好地替换它们：

$new_message = str_replace(array('l','p'), array('a','e'), $message);

字母l和p将替换为a和e。

如果它们的大小完全相同，为什么它不能使用完整的字母数组呢？

Answer 1

因为str_replace（）从左向右替换，所以在执行多次替换时，它可能会替换先前插入的值。

    // Outputs F because A is replaced with B, then B is replaced with C, and so on...
    // Finally E is replaced with F, because of left to right replacements.
    $search  = array('A', 'B', 'C', 'D', 'E');
    $replace = array('B', 'C', 'D', 'E', 'F');
    $subject = 'A';
    echo str_replace($search, $replace, $subject);

Answer 2

带有数组的

str_replace只是按顺序执行所有替换。使用strtr代替一次完成所有操作：

$new_message = strtr($message, 'lmnopq...', 'abcdef...');

Answer 3

比str_replace

简单易行

<?php
$arr = array(
    "http://" => "http://www.",
    "w" => "W",
    "d" => "D");

    $word = "http://desiweb.ir";
    echo strtr($word,$arr);
?>

strtr PHP文档 here

Answer 4

除了标记为正确的答案外，如果你必须替换单词而不是字符，你可以用这段代码来完成：

$query = "INSERT INTO my_table VALUES (?, ?, ?, ?);";
$values = Array("apple", "oranges", "mangos", "papayas");
foreach (array_fill(0, count($values), '?') as $key => $wildcard) {
    $query = substr_replace($query, '"'.$values[$key].'"', strpos($query, $wildcard), strlen($wildcard));
}
echo $query;

在这里演示：http://sandbox.onlinephpfunctions.com/code/56de88aef7eece3d199d57a863974b84a7224fd7

Answer 5

如果文本是简单标记且具有现有锚，请首先暂存现有的锚标记，交换掉网址，然后替换暂存的标记。

$text = '
Lorem Ipsum is simply dummy text found by searching http://google.com/?q=lorem in your <a href=https://www.mozilla.org/en-US/firefox/>Firefox</a>,
<a href="https://www.apple.com/safari/">Safari</a>, or https://www.google.com/chrome/ browser.

Link replacements will first stage existing anchor tags, replace each with a marker, then swap out the remaining links.
Links should be properly encoded.  If links are not separated from surrounding content like a trailing "." period then they it will be included in the link.
Links that are not encoded properly may create a problem, so best to use this when you know the text you are processing is not mixed HTML.

Example: http://google.com/i,m,complicate--d/index.html
Example: https://www.google.com/chrome/?123&t=123
Example: http://google.com/?q='. urlencode('<a href="http://google.com">http://google.com</a>') .'
';

// Replace existing links with a marker
$linkStore = array();
$text = preg_replace_callback('/(<a.*?a>)/', function($match) use (&$linkStore){ $key = '__linkStore'.count($linkStore).'__'; $linkStore[$key] = $match[0]; return $key; }, $text);

// Replace remaining URLs with an anchor tag
$text = preg_replace_callback("/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/", function($match) use (&$linkStore){ return '<a href="'. $match[0] .'">'. $match[0] .'</a>'; }, $text);

// Replace link markers with original
$text = str_replace(array_keys($linkStore), array_values($linkStore), $text);

echo '<pre>'.$text;

带数组的str_replace

5 个答案: