PHP splitting and synthesizing string function analysis

Split the string

The splitting of the string is achieved through the explode()function. The explode() function splits a string according to the specified rules, and the return value is an array.

The syntax format is as follows:

explode(separator,string,limit)

The parameter list of the function is as follows:

#Note: If separator is an empty string (" "), explode() will return false; if separator contains The value cannot be found in string, then the explode() function will return an array containing a single element of string.

If the limit parameter is set, the returned array contains up to limit elements, and the last element will contain the remainder of the string; if the limit parameter is a negative number, all but the last -limit elements are returned element.

Use the explode() function to split the string. The code to implement it is as follows:

<?php
 $str = "PHP手册@HTML手册@CSS手册@JAVA手册";
 $array = explode("@",$str);                  //使用@分割字符串
 var_dump($array);                            //输出字符串分割后的结果
?>

As can be seen from the above code, when splitting the string $str, use "@" Split as a split identifier, split into 4 array elements, and finally use the var_dump() function to output the elements in the array.

The running results are as follows:

array(4) {

                                                                                             Manual"

##                                                                                                                                                                                                                                                                            [1]=> string(10) "HTML Manual" "CSS Manual"

              [3]=> string(10) "JAVA Manual"

}

index of the first element of the array is 0. For related knowledge about arrays, please refer to PHP Chinese website Array array

In addition to using the var_dump() function, you can also use the echo statement to output array elements. The difference between the two is that the var_dump() function outputs an array column, while using echo The statement outputs a single element in the array. Replace "var_dump($array);

<?php
$str = "PHP手册@HTML手册@CSS手册@JAVA手册";
$array = explode("@",$str);                  //使用@分割字符串
echo $array[0];                              //输出数组中的第1个元素
echo $array[1];                              //输出数组中的第2个元素
echo $array[2];                              //输出数组中的第3个元素
echo $array[3];                              //输出数组中的第4个元素
?>

The implode() function can combine the contents of an array into a new string. The syntax format is as follows:

implode(separator,array)

<?php
$str = "PHP手册@HTML手册@CSS手册@JAVA手册";
$array = explode("@",$str);                  //使用@分割字符串
$arr = implode("*",$array);                  //将数组使用*组合成字符串
echo $arr;                                   //输出字符串
?>

PHP Manual*HTML Manual*CSS Manual*JAVA Manual

implode() function and explode() function are two There are two relative functions, one used to synthesize strings and one used to separate strings.

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