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How to get the first letter of a string in php_PHP tutorial

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Release： 2016-07-13 10:00:17

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How to get the first letter of a string in php

This article mainly introduces the method of getting the first letter of a string in php, supports the operation of Chinese strings, and involves the operation of strings in php The skills have certain reference value. Friends in need can refer to it

The example in this article describes how to obtain the first letter of a string in PHP. Share it with everyone for your reference. The specific implementation method is as follows:

$limit = array( //gb2312 拼音排序

array(45217,45252), //A

array(45253,45760), //B

array(45761,46317), //C

array(46318,46825), //D

array(46826,47009), //E

array(47010,47296), //F

array(47297,47613), //G

array(47614,48118), //H

array(0,0), //I

array(48119,49061), //J

array(49062,49323), //K

array(49324,49895), //L

array(49896,50370), //M

array(50371,50613), //N

array(50614,50621), //O

array(50622,50905), //P

array(50906,51386), //Q

array(51387,51445), //R

array(51446,52217), //S

array(52218,52697), //T

array(0,0), //U

array(0,0), //V

array(52698,52979), //W

array(52980,53688), //X

array(53689,54480), //Y

array(54481,55289), //Z

);

$str="A:这是一个测试程序1";

$str= iconv("UTF-8","gb2312", $str);

echo $str."
";

$i=0;

while($i

$tmp=bin2hex(substr($str,$i,1));

if($tmp>='B0'){ //汉字的开始

$t=getLetter(hexdec(bin2hex(substr($str,$i,2))));

printf("%c",$t==-1 ? '*' : $t );

$i =2;

}

else{

printf("%s",substr($str,$i,1));

$i ;

}

function getLetter($num){

global $limit;

$char_index=65;

foreach($limit as $k=>$v){

if($num>=$v[0] && $num<=$v[1]){

$char_index =$k;

return $char_index;

}

return -1;

}

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<🎜>$limit = array( //gb2312 Pinyin sorting<🎜> <🎜>array(45217,45252), //A<🎜> <🎜>array(45253,45760), //B<🎜> <🎜>array(45761,46317), //C<🎜> <🎜>array(46318,46825), //D<🎜> <🎜>array(46826,47009), //E<🎜> <🎜>array(47010,47296), //F<🎜> <🎜>array(47297,47613), //G<🎜> <🎜>array(47614,48118), //H<🎜> <🎜>array(0,0), //I<🎜> <🎜>array(48119,49061), //J<🎜> <🎜>array(49062,49323), //K<🎜> <🎜>array(49324,49895), //L<🎜> <🎜>array(49896,50370), //M<🎜> <🎜>array(50371,50613), //N<🎜> <🎜>array(50614,50621), //O<🎜> <🎜>array(50622,50905), //P<🎜> <🎜>array(50906,51386), //Q<🎜> <🎜>array(51387,51445), //R<🎜> <🎜>array(51446,52217), //S<🎜> <🎜>array(52218,52697), //T<🎜> <🎜>array(0,0), //U<🎜> <🎜>array(0,0), //V<🎜> <🎜>array(52698,52979), //W<🎜> <🎜>array(52980,53688), //X<🎜> <🎜>array(53689,54480), //Y<🎜> <🎜>array(54481,55289), //Z<🎜> <🎜>);<🎜> <🎜>$str="A: This is a test program 1";<🎜> <🎜>$str= iconv("UTF-8","gb2312", $str);<🎜> <🎜>echo $str."
"; $i=0; while($i <🎜>$tmp=bin2hex(substr($str,$i,1));<🎜> <🎜>if($tmp>='B0'){ //The beginning of Chinese characters $t=getLetter(hexdec(bin2hex(substr($str,$i,2)))); printf("%c",$t==-1 ? '*' : $t ); $i =2; } else{ printf("%s",substr($str,$i,1)); $i ; } } function getLetter($num){ global $limit; $char_index=65; foreach($limit as $k=>$v){ if($num>=$v[0] && $num<=$v[1]){<🎜> <🎜>$char_index =$k;<🎜> <🎜>return $char_index;<🎜> <🎜>}<🎜> <🎜>}<🎜> <🎜>return -1;<🎜> <🎜>}<🎜> <🎜>?>

I hope this article will be helpful to everyone’s PHP programming design.