PHP Knowledge Points Review of Strings_PHP Tutorial

These are all typed out with hard work. Remember to come back and take a look! ! !

/*echo qqqqqqnqqqqqqq
qqqqqqqqqqqqqrqqqqqqqqqqqqqqqqqq
mark*/
//The technical logo should be on a new line and written in top format!
//The function is similar to ""
//The most fatal point is: there cannot be any symbols after mark, that is, it must be used in the last part of the code






$a = "aaaaaaaaaa";
$b = "bbbbbbbbbb";
$c = print($a);


echo "
";
echo $c;
echo "
";
echo $a,$b;


//5b binary format; %c ASCII format
$format = "%b,%c";
printf($format,100,200);
echo sprintf($format,100,200);
echo "
";




$str = "abcdefghijklmnopqrstyvwxyz";
$width = 4;
$break = "t";
echo wordwrap($str,$width,$break,true);


/*strtoupper();
strtolower();
ucwords();*/


//strlen()
//The spaces in the string also count as one


//Usage of substr_count(string str,string sub,[int start,int length])
$words = "ran zhang li ni ran ran";
$handle = "ran";
$count = substr_count($words,$handle);
echo $count;




//mixed str_word_count(string $str,[int format,string $child]);
//format 0: default value, return the number of words
// 1: Return an array of words, the key is the index value
// 2: Return an array of words, the key is the position of the first letter of the word




//Find substring
$a1 = "aaaaaabdddddd";
$a2 = "b";
$a3 = strstr($a1,$a2);
echo $a3;
//Output bdddddd




//Location search, almost the same as above, returns the location
//int strpos(string $a,string b,[int offset]);






//String copy
echo "
";
$input = "zhangran";
$number = 10;
$str = str_repeat($input,$number);
echo $str;




//Reverse string
echo "
";
$a4 = strrev("abc");
echo $a4;




//Replace
//substr_replace(mixed $string,string $replacement,int $start,[int $length])




//Slice
echo "
";
$a5 = "hello,world,i,am,the,only,one";
$separator = ",";
$a7 = 3;
$array = explode($separator,$a5,$a7);
print_r($array);


echo "
";
$a8 = "qqqqqqqqqqqqqqqqqqq";
$a9 = 4;
$b3 =str_split($a8,$a9);
print_r($b3);
//If it cannot be sorted out, put the previous ones first



//Merge
echo "
";
$b4 = array("aaa","bbb","ccc");
$b5 = ",";
echo implode($b5,$b4);


//Comparison of strings
//int strcmp(str1,str2) This is a complete comparison


//strncmp(str1,str2,len) compares the first len ​​strings of two strings to see if they are equal

Column by kaituozhe345

http://www.bkjia.com/PHPjc/478418.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/478418.htmlTechArticleThese are all typed out with hard work. Remember to come back and take a look! ! ! /*echo mark qqqqqqnqqqqqqbrqqqqqqqqqqqqrqqqqqqqqqqqqqqqq mark*/ //The technical mark should be on a new line,...