Is there a function to add 0 in php?

There are functions to implement 0 padding in PHP, which are: 1. "str_pad()" function, the syntax is "str_pad (value, length after padding 0, "0", position to pad 0) "; 2. sprintf() function, the syntax is "sprintf(format, value)".

The operating environment of this article: Windows 10 system, PHP version 7.1, Dell G3 computer.

Does PHP have a function for padding zeros?

There are two functions in PHP - at least two of them. I don’t know if there are others that can pad zeros for numbers. str_pad( ), sprintf() details are as follows

str_pad

As the name suggests, this function is for strings. It can fill the specified string with any other string

For example: str_pad (padded string, padded length, padded string, padded position)

The padded length must be a positive integer, and there are three options for the padded position,

Left: STR_PAD_LEFT,

Right: STR_PAD_RIGHT,

Both ends: STR_PAD_BOTH

For example:

echo str_pad(1,8,"0",STR_PAD_LEFT);

Result: 00000001

echo str_pad(1,8,"0",STR_PAD_RIGHT);

Result: 10000000

echo str_pad(1,8,"0",STR_PAD_BOTH);

Result: 00010000

One detail worth noting in the above example is that if the number of digits to be filled is an odd number, for example, 7 is filled in Example 3 0, right side first.

Let’s look at another method of zero padding, sprintf

But I won’t say so much, because it is so flexible to use that I basically don’t know how to use it. , but it is still very convenient to use zero padding on the left (or zero padding after the decimal point)

Let’s look at padding zeros on the left first

echo sprintf("%05d",1);

Let’s talk about the meaning of d first, use a 5-digit number The parameters after the digital formatting, if there are less than 5 digits, add zeros

The running result is 00005

Look at the decimal point and add zeros

echo sprintf("%01.3f",1);

.3f means Say, use a floating-point number with at least three decimal places and zero padding after the decimal point and at least one decimal place and zero padding before the decimal point to format the following parameters

. The result of the operation is: 1.000

Regarding the two methods of padding zeros, you can choose to use them. In fact, each has its own advantages and disadvantages. sprintf can ensure that you will not make a mistake in filling 1 into 1000000 haha. str_pad can ensure that you pad whatever you want.

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