it misses the last character
add $string[$i-1] to $elements[$j] before doing $j++ at the end of the loop
sorry, wrote this in one shot
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Question
parse string
I am trying to convert a long string of characters into an array, split by character groups.
For example, from the string "AAABCCCCDDAAAAEEE", I need separate strings "AAA" "B" "CCCC" "DD" "AAAA" "EEE"
Thanks for your help.
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Answers
VGR,
Little change was needed to produce the required results:
$oldchar=$string[0];
$curchar=$string[$i+1];
no j++ after loop finishes, as follows:
<?
$string="AAABCCCCDDAAAAEEE
$elements=array();
$i=0; // counter of chars
$j=0; // counter of elements
$oldchar=$string[0];
while ($i<strlen($string)) {
$curchar=$string[$i+1];
if ($curchar<>$oldchar) { // add found string before continuing
$elements[$j].=$oldchar;
$oldchar=$curchar;
$j++;
}
else $elements[$j].=$curchar; // if we broke sequence
$i++;
} // while string not parsed completely
for ($i=0; $i<$j;$i++) echo "element $i = '".$elements[$i]."'<BR>";
?>
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by: VGRPosted on 2003-03-20 at 11:14:23ID: 8176133
well, no other "regexp-free" choice than :
<?
// initialisations
$string="AAABCCCCDDAAAAEEE
$elements=array(); // array[*] of String in high-level languages
// loop
$i=0; // counter of chars
$j=0; // counter of elements
$oldchar=$string[1];
while ($i<strlen($string)) {
$curchar=$string[$i];
if ($curchar<>$oldchar) { // add found string before continuing
$elements[$j].=$oldchar;
$oldchar=$curchar;
$j++;
} else $elements[$j].=$curchar; // if we broke sequence
$i++;
} // while string not parsed completely
$j++; // end of loop
// display
for ($i=0; $i<$j;$i++) echo "element $i = '".$elements[$i]."'<BR>";
?>
produces this :
element 0 = 'AAAA'
element 1 = 'B'
element 2 = 'CCCC'
element 3 = 'DD'
element 4 = 'AAAA'
element 5 = 'EE'