PHP:如何获取字符串的字符一一

Question

$str = "8560841836";
$mystr = array($str);
$string = strlen($str);
for($i=0; $i<=$string; $i++){   echo $string[$i]."\n";  }

此代码在一行中打印此字符串，但我希望在一行中的一个字符中打印此字符串，依此类推...

Answer 1

从the PHP documentation:

Characters within strings may be accessed and modified by specifying the zero-based offset of the desired character after the string using square array brackets, as in $str[42]. Think of a string as an array of characters for this purpose. The functions substr() and substr_replace() can be used when you want to extract or replace more than 1 character.

Note: Strings may also be accessed using braces, as in $str{42}, for the same purpose.

Warning Internally, PHP strings are byte arrays. As a result, accessing or modifying a string using array brackets is not multi-byte safe, and should only be done with strings that are in a single-byte encoding such as ISO-8859-1.

例子:

// Get the first character of a string
$str = 'This is a test.';
$first = $str[0]; // 't'

// Get the third character of a string
$third = $str[2]; // 'i'

// Get the last character of a string.
$str = 'This is still a test.';
$last = $str[strlen($str)-1];  // '.'

// Modify the last character of a string
$str = 'Look at the sea';
$str[strlen($str)-1] = 'e'; // 'Look at the see'

因此，在您的情况下，这非常简单:

$str = '8560841836';
$len = strlen($str);

for($i = 0; $i < $len; ++$i) // < and not <=, cause the index starts at 0!
    echo $str[$i]."\n";