字符串替换来自单词数组的不区分大小写的完全匹配

Question

在PHP中,我有一个单词数组,我想搜索并替换字符串中不区分大小写的完全匹配.例:

$pattern = array("base", "all");
$str = "first base baseball for all";

$str = str_ireplace($pattern, "FOUND", $str);
echo $str;

输出:第一个FOUND FOUNDbFOUND for FOUND
预期:FOUND的第一个FOUND棒球

我不希望'棒球'被替换,因为我只想要替换整个单词.有没有办法实现这个目标？

Answer 1

使用preg_replace()而不是str_ireplace()为此,因为您可以在正则表达式中定义单词边界.

$str = "first base baseball for all";
$pattern = '/\b(base|all)\b/i';
$str = preg_replace($pattern, "FOUND", $str);

echo $str;
// first FOUND baseball for FOUND

如果从数组开始,可以执行此操作以从数组中构建正则表达式:

$words = array('base','all');
// implode() words into a pipe-delimited string
$pattern = '/\b(' . implode("|", $words) . ')\b/i';
$str = preg_replace($pattern, "FOUND", $str);