对php中str_replace()函数的详解

str_replace()的语法：

str_replace mixed $search  ,mixed $replace, mixed $subject [, int &$count  ] ) : mixed

1.search ,replace都是字符串

<?PHP

$bodytag = str_replace(%body%, black, <body text='%body%'>);
echo $bodytag; //输出：<body text='black'>
?>

2.search是数组 ,replace是字符串

<?PHP

$vowels = array(a, e, i, o, u, A, E, I, O, U);
$onlyconsonants = str_replace($vowels, , Hello World of PHP);
echo $onlyconsonants;// 输出： Hll Wrld f PHP
?>

3.search ,replace都是数组

<?PHP
$phrase  = You should eat fruits, vegetables, and fiber every day.;
$healthy = array(fruits, vegetables, fiber);
$yummy   = array(pizza, beer, ice cream);
$newphrase = str_replace($healthy, $yummy, $phrase);
//输出：You should eat pizza, beer, and ice cream every day
?>

4.含有第三个参数

<?PHP
$str = str_replace(ll, , good golly miss molly!, $count);
echo $count;// 赋值: 2
?>

ps: search ,replace的第一组替换会影响到第二组，如下

$search  = array('A', 'B', 'C', 'D', 'E');
$replace = array('B', 'C', 'D', 'E', 'F');
$subject = 'A';
echo str_replace($search, $replace, $subject).<br/>;
// 输出 F ，因为 A 被 B 替换，B 又被 C 替换，以此类推...
// 由于从左到右依次替换，最终 E 被 F 替换

对php中str_replace()函数的详解

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