PHP_string_functions.md

2014/8/4 #PHP 常用字符串处理函数 ###strlen($str):

计算字符串长度

$str = 'Hello world';
echo strlen($str);

###str_replace(search, repalce, $str):

字符串替换

$str = 'Fuck you';
$str = str_replace('Fuck', '***', $str);
echo $str;

###strtr($str, array('from'=>'to')):

根据多个条件替换,条件用数组传递

$str = 'Fuck you,shit,bitch';
$str = strtr($str, array('Fuck'=>'***', 'shit'=>'***', 'bitch'=>'***'));
echo $str;

###substr($str, start, length):

截取子字符串

$str = 'tommow is another day';
echo substr($str, 0, 3);    //从头开始,截取 3 个字符
echo substr($str, 0, -3);    //从头开始,截至倒数 3 个字符

###explode(delimiter, $str):

拆分字符串,拆分成数组

$str = 'a, b, c';
$arr = explode(',', $str);
print_r($arr);

###implode(array(), delimiter):

将数组拼接成字符串

$str = 'a, b, c';
$arr = explode(',', $str);
$str = implode($arr, ',');
echo $str;