PHP characters Intercept Chinese anti-garbled use. chr (0) workaround

PHP code

<?php    $len = +;    $text = "How will the long title of the news show only a few words in front, followed by ..." To replace it? ";    echo strlen ($text) <= $len? $text: (substr ($text, 0, $len). chr (0). " ....");    ? >

Chr (0) is not NULL

Null is nothing, and Chr (0) has a value of 0. 16 binary is 0x00, which means binary is 00000000

Although Chr (0) will not show anything, but he is a character.

When the Chinese character is truncated, according to the coding rules he always vlasov the other words in the back together as a Chinese character interpretation, which is the reason for garbled. A combination of 0x81 to 0xFF and 0x00 always shows as "empty"

According to this characteristic, a Chr (0) is appended to the result of substr to prevent garbled characters.

Note:

Encode first byte second byte

gb2312 0xa1-0xf7 0xa1-0xfe

GBK 0x81-0xfe 0x81-0xfe 0x40-0x7e

Big5 0xa1-0xf7 0x81-0xfe 0x40-0x7e

Another way:

PHP code

function Csubstr ($text, $limit) {        $s = ';        for ($i =0; $i < $limit 3; $i + +) {            $s. = Ord ($text [$i]) >127? $text [$i]. $text [+ + $i]: $text [$i];        }        return $s;    }

The above applies only to gb2312 encoding, if it is UTF-8, the 4th line should be changed to

PHP code

$s. = Ord ($text [$i]) >127? $text [$i]. $text [+ + $i]. $text [+ + $i]: $text [$i];

The kanji in UTF-8 is 3 bytes.

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