PHP loop for WordPress custom fields - php

Question

I have a section of a website that uses a lot of custom fields for images. I also have a slider that uses those fields so for every image there is a line of code using that custom field. I tried using a loop but something is not right as it doesn't get any of the fields then.
This is how it is right now:
<! -- Variables -->
<?php $image1 = get_field('img-1'); ?>
<?php $image2 = get_field('img-2'); ?>
<?php $image3 = get_field('img-3'); ?>
<?php $image4 = get_field('img-4'); ?>
<?php $image5 = get_field('img-5'); ?>
<?php $image6 = get_field('img-6'); ?>
<?php $image7 = get_field('img-7'); ?>
<?php $image8 = get_field('img-8'); ?>
<?php $image9 = get_field('img-9'); ?>
<?php $image10 = get_field('img-10'); ?>
<!-- Slider -->
<div id="slider-constructora" class="flexslider">
<ul class="slides"> <?php if( $image1 ): ?>
<li><img class="img-responsive" src="<?php echo
<?php if( $image1 ): ?>
<li><img class="img-responsive" src="<?php echo $image1['url']; ?>"></li>
<?php endif; ?>
<?php if( $image2 ): ?>
<li><img class="img-responsive" src="<?php echo $image2['url']; ?>"></li>
<?php endif; ?>
<?php if( $image3 ): ?>
<li><img class="img-responsive" src="<?php echo $image3['url']; ?>"></li>
<?php endif; ?>
<?php if( $image4 ): ?>
<li><img class="img-responsive" src="<?php echo $image4['url']; ?>"></li>
<?php endif; ?>
<?php if( $image5 ): ?>
<li><img class="img-responsive" src="<?php echo $image5['url']; ?>"></li>
<?php endif; ?>
<?php if( $image6 ): ?>
<li><img class="img-responsive" src="<?php echo $image6['url']; ?>"></li>
<?php endif; ?>
<?php if( $image7 ): ?>
<li><img class="img-responsive" src="<?php echo $image7['url']; ?>"></li>
<?php endif; ?>
<?php if( $image8 ): ?>
<li><img class="img-responsive" src="<?php echo $image8['url']; ?>"></li>
<?php endif; ?>
<?php if( $image9 ): ?>
<li><img class="img-responsive" src="<?php echo $image9['url']; ?>"></li>
<?php endif; ?>
<?php if( $image10 ): ?>
<li><img class="img-responsive" src="<?php echo $image10['url']; ?>"></li>
<?php endif; ?>
</ul>
</div><!-- slider -->
This is what I have tried to use inside of the slider without success, I use it on another website and it does work, but not in this case:
<?php
for( $iteration = 1; $iteration <= 150; $iteration++){
if ( get_field("image".$iteration ) ){ ?>
<li><img class="img-responsive" src="<?php echo get_field("image".$iteration)['url'] ?>"></li>
<?php } ?>
<?php } ?>

Answer 1

It looks like you have a syntax error. Note this part of the code:
<li><img class="img-responsive" src="<?php echo
<?php if( $image1 ): ?>
You did not finish your echo or close your PHP tag before opening a new PHP tag and starting an IF statement. This will throw a fatal error.
I suggest enabling WP_DEBUG so that it is easier to catch these types of errors. To do this change or add define( 'WP_DEBUG', true ); so that it is true. Debugging in WordPress (Codex)