


How to upgrade the php5.3 version to php5.4 or php5.5, php5.3php5.4
Today our technical article on php is mainly introduced to our friends. How to use yum to install version 5.4 or 5.5 of php. Of course we use centos6.5 as our test machine. In fact, it is very simple. You can easily install version 5.4 of PHP with the following two commands.
Copy code The code is as follows:
yum remove php php-bcmath php-cli php-common php-devel php-fpm
php-gd php-imap php-ldap php-mbstring php-mcrypt php-mysql php-odbc php-pdo php-pear php-pecl-igbinary php-xml php-xmlrpc
rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
yum install php54w php54w-bcmath php54w-cli php54w-common php54w-devel php54w-fpm php54w-gd php54w-imap php54w-ldap php54w-mbstring php54w-mcrypt php54w-mysql php54w-odbc php54w-pdo php 54w-pear php54w-pecl-igbinary php54w-xml php54w-xmlrpc php54w-opcache php54w-intl php54w-pecl-memcache
Of course, if it is extended, you can add or delete it according to your own needs. As for the installation of php5.5, it is still similar to the installation of php5.4.
Copy code The code is as follows:
yum remove php php-bcmath php-cli php-common php-devel php-fpm php-gd php-imap php-ldap php-mbstring php-mcrypt php-mysql php-odbc php-pdo php-pear php-pecl-igbinary php-xml php-xmlrpc
rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
yum install php55w php55w-bcmath php55w-cli php55w-common php55w-devel php55w-fpm php55w-gd php55w-imap php55w-ldap php55w-mbstring php55w-mcrypt php55w-mysql php55w-odbc php55w-pdo php 55w-pear php55w-pecl-igbinary php55w-xml php55w-xmlrpc php55w-opcache php55w-intl php55w-pecl-memcache
The above content is all stated in this article, I hope you all like it.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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