Home > Article > Backend Development > 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 $str = 'abcdef'; print_r(ascii_encode($str));
Related references:php中文网
The above is the detailed content of How to convert string to ASCII code in php. For more information, please follow other related articles on the PHP Chinese website!