The control input box can only enter numbers and decimal points, but when you enter numbers on the ios and then enter English, it will clear out all the English and digits.

<input type="text" placeholder=""  maxlength="13" oninput="this.value=(this.value.replace(/[^0-9.]+/,""))"/>

when using the above code to input input, control input can only enter numbers and decimal point
, but first enter 12333, then switch to English keyboard input English Yes, clear English at the same time the previous 12333 will also be cleared, and must appear on ios

Replace

Mar.16,2021

how to solve this problem?

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Given that the elements in an array $arr, array are from 0 to N < = $N < = 1, find out whether there are any duplicate elements, which requires a time complexity of O (n), and a space complexity of O (1).
given that the elements in an array $arr, array are 0 to NMagi N < = $NMMI 1, find out whether there are any duplicate elements. The time complexity is O (n), and the space complexity is O (1) ....

Php time-complexity search-and-replace array algorithm

Mar.09,2021
If all zeros in str_replace will be replaced, how can you just let him replace them in the first number 0?
str_replace(substr($_SESSION[ phone ], 0, 1), +64 , $_SESSION[ phone ]); assuming that I am 0111012123 , he will be replaced by + 641111612123 . gets the first zero, but str_replace will change all 0 to + 64 . what a pain in the neck ...

String replace php7 php

Apr.11,2021

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea6f2e-47bde.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea6f2e-47bde.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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