用另一个引号 (') 替换单引号 (') str_replace

Question

I am trying to replace a single quote ( ' ) with another quote ( ' ), but I can't seem to get anything to work. Also, how can I make this work on multiple strings ($text, $title, $notice) ?

input: don't

output: don't

I am trying this:

$text = str_replace(array("'",'"'), array('’'), $text);    
$text = htmlentities(str_replace(array('"', "'"), '’', $text);
$text = htmlentities(str_replace(array('"', "'"), '’', $_POST['text']));
$text = str_replace("'" ,"’",$text);
$text = str_replace("'" ,"’",$text);
$text = str_replace(array("'"), "’", $text);
$text = str_replace(array("\'", "'", """), "’", htmlspecialchars($text));
$text = str_replace(array('\'', '"'), '’', $text);
$text = str_replace(chr(39), chr(146), $text);
$text  = str_replace("'", "&ampquot;", $text); 

None of this works.

Answer 1

When you use an array as replacements, give as many replacements as you give needles. Else use a simple string.

<?php
$text = 'Peter\'s cat\'s name is "Tom".';
$text = str_replace(array("'",'"'), '’', $text);  
echo $text;

$text = 'Peter\'s cat\'s name is "Tom".';
$text = str_replace(array("'",'"'), array('’', '`'), $text);  
echo $text;
?>

To perform that task on multiple variables you could do

<?php
$text   = 'Peter\'s cat\'s name is "Tom".';
$title  = 'Peter\'s cat\'s name is "Tom".';
$notice = 'Peter\'s cat\'s name is "Tom".';

foreach([&$text, &$title, &$notice] as &$item)
  $item = str_replace(array("'",'"'), '’', $item);  

echo "text: $text<br>title: $title<br>notice: $notice";
?>

Answer 2

I tried using preg_replace() and it worked perfectly first time:

$text = "Someone told me about a 'bacon and cheese sandwich'";
$text = preg_replace("#\'#", '’', $text);
echo $text;

Output
Someone told me about a 'bacon and cheese sandwich'

Give that a go.