The Str_pad () function of the PHP string is used

Str_pad

• (PHP 4 >= 4.0.1, PHP 5, PHP 7)
• Str_pad-pad a string to a certain length with another string
• Str_pad-fills a string with another string for a specified length

Description

str_pad(     $input,     $pad_length[,     $pad_string" "[,     $pad_typeSTR_PAD_RIGHT]])//This function returns the input string padded on the left, the right, or both sides to the specified padding length. If the optional argument pad_string is not supplied, the input is padded with spaces, otherwise it is padded with characters from pad_string up to the limit.//该函数返回 input 被从左端、右端或者同时两端被填充到制定长度后的结果。如果可选的 pad_string 参数没有被指定，input 将被空格字符填充，否则它将被 pad_string 填充到指定长度。

Parametersinput

• The input string.
• The input string.

Pad_length

• If the value of pad_length is negative, less than, or equal to the length of the input string, no padding takes place, and Input would be returned.
• If the value of pad_length is negative, less than or equal to the length of the input string, no padding occurs, and input is returned.

Pad_string

Note:

• The pad_string may truncated if the required number of padding characters can ' t is evenly divided by the pad_string ' s L Ength.
• If the length of the padding character cannot be divisible by pad_string, then pad_string may be shortened.

Pad_type

• Optional argument Pad_type can be str_pad_right, str_pad_left, or Str_pad_both. If Pad_type is not specified it's assumed to be str_pad_right.
• The possible values for the optional pad_type parameter are STR_PAD_RIGHT , STR_PAD_LEFT or STR_PAD_BOTH . If Pad_type is not specified, it is assumed to be STR_PAD_RIGHT .

Return Values

• Returns the padded string.
• Returns the populated string.

Examples

<?php/** * Created by Phpstorm. * User:zhangrongxiang * DATE:2018/2/19 * Time: PM 10:59 *///function str_pad ($input, $pad _length, $pad _string = null, $p Ad_type = null) {} $input = "zing"; $str = Str_pad ($input);//"Zing" echo $str. Php_eol;//10echo strlen ($STR). Php_eol;//zing******echo Str_pad ($input, 10, "*"). php_eol;//^^ ^^ ^^ zingecho str_pad ($input, "^", str_pad_left).  Php_eol; Output "-=-=-alien"//___zing___echo str_pad ($input, Ten, "_", Str_pad_both). Php_eol;//zing=echo Str_pad ($input, 5, "= ="). Php_eol;//zingecho Str_pad ($input, 3, "-"). php_eol;///////////////////////////////////////////////////////////////** * Since the default pad_type is STR_PAD_ Right. * Using Str_pad_both were always favor in the right PAD * If the required number of padding characters can ' t be evenly div IDed. *///ppinputpppecho str_pad ("Input", Ten, "pp", Str_pad_both). Php_eol;//inputpecho str_pad ("Input", 6, "P", Str_pad_both). Php_eol;//pinputppecho Str_pad ("inPut ", 8," P ", Str_pad_both). Php_eol;/////////////////////////////////////////////////////////////function Str_pad_unicode ($str, $pad _len, $    Pad_str = ", $dir = str_pad_right) {$str _len = Mb_strlen ($STR);    $pad _str_len = Mb_strlen ($pad _str);  if (! $str _len && ($dir = = Str_pad_right | | $dir = = str_pad_left)) {$str _len = 1;//@debug} if (! $pad _len | |! $pad _str_len | | $pad _len <= $str _len)    {return $str;    } $result = null;    $repeat = ceil ($str _len-$pad _str_len + $pad _len);        if ($dir = = str_pad_right) {$result = $str. Str_repeat ($pad _str, $repeat);    $result = mb_substr ($result, 0, $pad _len);        } else if ($dir = = str_pad_left) {$result = Str_repeat ($pad _str, $repeat). $str;    $result = Mb_substr ($result,-$pad _len);        } else if ($dir = = Str_pad_both) {$length = ($pad _len-$str _len)/2;        $repeat = Ceil ($length/$pad _str_len); $result = Mb_substr (Str_repeat ($pad _str, $repeat), 0, Floor ($length)). $str.    Mb_substr (Str_repeat ($pad _str, $repeat), 0, Ceil ($length)); } return $result;} $str = "Shoot the yellow film";//ha-pat-huang-ha-echo str_pad_unicode ($STR, 5, ' ha ', Str_pad_both). php_eol;//hahaha Shoot the yellow piece haha haha echo str_pad_unicode ($str, 10, ' ha ', Str_pad_both).       Php_eol;function Mb_str_pad ($str, $pad _len, $pad _str = ", $dir = str_pad_right, $encoding = null) {$encoding = $encoding = = = null?    Mb_internal_encoding (): $encoding; $padBefore = $dir = = = Str_pad_both | |    $dir = = = Str_pad_left; $padAfter = $dir = = = Str_pad_both | |    $dir = = = Str_pad_right;    $pad _len-= Mb_strlen ($str, $encoding); $targetLen = $padBefore && $padAfter?    $pad _LEN/2: $pad _len;    $strToRepeatLen = Mb_strlen ($pad _str, $encoding);    $repeatTimes = Ceil ($targetLen/$strToRepeatLen); $repeatedString = Str_repeat ($pad _str, max (0, $repeatTimes)); Safe if used WITH valid utf-8 strings $before = $padBefore?    Mb_substr ($repeatedString, 0, Floor ($targetLen), $encoding): "; $after = $padAfter?        Mb_substr ($repeatedString, 0, Ceil ($targetLen), $encoding): "; Return $before. $str. $after;} Ha-pat-huang-ha-echo mb_str_pad ($STR, 5, ' ha ', Str_pad_both). php_eol;//hahaha Shoot the yellow piece haha haha echo mb_str_pad ($str, 10, ' ha ', Str_pad_both). Php_eol;///////////////////////////////////////////////////////////////////////function Pad_between_strings ($        String1, $string 2, $length, $char = "") {$fill _length = $length-(strlen ($string 1) + strlen ($string 2)); Return $string 1. Str_repeat ($char, $fill _length). $string 2;} Abc**************123echo pad_between_strings ("abc", "123", 20, "*"). Php_eol;

See

• http://php.net/manual/zh/function.str_pad.php

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The Str_pad () function of the PHP string is used