How to convert string to ASCII code in php

#How to convert a string into ASCII code in php?

First create a new php file and add the following code:

<?php
function ascii_encode($c, $prefix="&#") {
    $len = strlen($c);
    $a = 0;
    while ($a < $len) {
        $ud = 0;
        if (ord($c{$a}) >= 0 && ord($c{$a}) <= 127) {
            $ud = ord($c{$a});
            $a += 1;
        } else if (ord($c{$a}) >= 192 && ord($c{$a}) <= 223) {
            $ud = (ord($c{$a}) - 192) * 64 + (ord($c{$a + 1}) - 128);
            $a += 2;
        } else if (ord($c{$a}) >= 224 && ord($c{$a}) <= 239) {
            $ud = (ord($c{$a}) - 224) * 4096 + (ord($c{$a + 1}) - 128) * 64 + (ord($c{$a + 2}) - 128);
            $a += 3;
        } else if (ord($c{$a}) >= 240 && ord($c{$a}) <= 247) {
            $ud = (ord($c{$a}) - 240) * 262144 + (ord($c{$a + 1}) - 128) * 4096 + (ord($c{$a + 2}) - 128) * 64 + (ord($c{$a + 3}) - 128);
            $a += 4;
        } else if (ord($c{$a}) >= 248 && ord($c{$a}) <= 251) {
            $ud = (ord($c{$a}) - 248) * 16777216 + (ord($c{$a + 1}) - 128) * 262144 + (ord($c{$a + 2}) - 128) * 4096 + (ord($c{$a + 3}) - 128) * 64 + (ord($c{$a + 4}) - 128);
            $a += 5;
        } else if (ord($c{$a}) >= 252 && ord($c{$a}) <= 253) {
            $ud = (ord($c{$a}) - 252) * 1073741824 + (ord($c{$a + 1}) - 128) * 16777216 + (ord($c{$a + 2}) - 128) * 262144 + (ord($c{$a + 3}) - 128) * 4096 + (ord($c{$a + 4}) - 128) * 64 + (ord($c{$a + 5}) - 128);
            $a += 6;
        } else if (ord($c{$a}) >= 254 && ord($c{$a}) <= 255) { //error
            $ud = false;
        }
        $scill .= $prefix.$ud.";";
    }
    return $scill;
}

Then customize a string and use this function to transcode it.

<?php
$str = &#39;abcdef&#39;;
print_r(ascii_encode($str));

Related references:php中文网

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